M77/M78 Two Color Transmitter

2-Color Non-Contact
Infrared Temperature Transmitters
for Industrial and Laboratory Applications
• Self-contained sensor head with 4-20mA linear output
• Through-lens sighting
• Variable focussing
• 0.5% accuracy
• High resolution optics
• Microprocessor control capability
• Unmatched accessories
• Two year warranty
Model M77LS
Laboratory Version
Model M77/77S
through-lens sighting (M77S)
Fiber Optic Model M78
for Harsh Environments
Mikron M77/78 Series

M77/78 2-color Infrared Temperature Transmitters
Innovative Design
The M77/78 series “Infraducers”
represent a milestone in infrared
temperature measurement technology.
They are the first commercially
available, completely self-contained,
2-color radiometers to produce a
4-20mA linear output. The “Infraducers”
represent the latest in
innovative technology, integrating
exclusive advanced electronic design
with optical and mechanical
precision that are the essence of
Mikron infrared products. Their
design from concept to finish is
based on simplicity of installation
and maintenance. The M77/78
series, with its matchless array of
accessories, demonstrates Mikron’s
continuing leadership in infrared
temperature measuring technology.
Why 2-color
Infrared Thermometry?
The M77/78 series are “state of the
art” instruments designed for the
measurement of temperatures above
250°C (500°F). They utilize the
2-color principle, in which the temperature
measurement is made by
ratioing the radiation intensities of
two adjacent wavelengths rather
than from absolute intensity as with
single band (or single color) instruments.
This design approach
eliminates a number of factors that
degrade the accuracy of conventional
instruments. For example,
temperature measurements with
the M77/78 are:
• Independent of emissivity
• Unaffected by dust and other
contaminants in the field of view
• Independent of target size (can
produce accurate reading with
only 5% of the target area
within field of view)
• Unaffected by moving target
within field of view
• Unaffected by dirty viewing
windows
point of failure in other instruments.
Also, there are no optical
or electronic adjustments to be
made in the field. An invalid signal
LED warns if the target radiation
intensity drops to a level too low
for reliable measurements.
The M77S Sensor Head incorporates
a high quality, high precision
variable focus optical system that
provides sharp focussing on the
desired target from about 2” (50mm)
to infinity. Focussing is executed by
turning the focussing knob on the
rear panel of the instrument.
The M77S enables precision
pinpointing of small target areas.
The user simply adjusts the instrument
until the desired target is
clear within a reticle.
M77LS for Laboratory
& Research Applications
The M77LS was specifically designed
for research and laboratory
applications and is readily adaptable
for either tripod or optical
bench use. Its through-lens sighting
and variable focussing features
permit precision pinpointing of the
target area.
M78 for Inaccessible or
Environmentally Severe
Applications
The fiber optics based M78
“Infraducer” is recommended for
areas where the following conditions
exist:
A. When direct sighting with the
M77S is impossible due to
obstructions. The flexibility
of the fiber optics cable overcomes
this problem.
B. Where RF or EMI interference
is a problem, requiring the
electronics to be placed at a
safe distance from the source
of interference.
C. Where exceptionally high ambient
temperatures exist. Fiber optic
tips and lens assemblies can
withstand temperatures up to
600°F (315°C) without cooling
and up to 1000°F (540°C) with
air cooling.
D. Where corrosive environments
prohibit the use of a conventional
system.
E. In vacuum applications where
sighting through the window
is difficult or impossible, a
fiber optics lens assembly can
be placed inside the vacuum
vessel.
F. When an intrinsically safe IR
temperature transmitter is
mandatory.
G. Environments where nuclear
radiation is present. A
specially designed lens and
fiber optics assembly can withstand
high nuclear radiation
levels.
M77LS Laboratory Version
Mikron 77/77S
for Industrial Applications
The M77 is housed in a compact,
rugged stainless steel housing only
8” (200mm) long and 2” (50mm) in
diameter. Superior design not only
insures accuracy and long term
reliability, it also guarantees interchangeability
between “Infraducers”
of the same model with ±0.75%
accuracy. This ensures that, should
one of the “Infraducers” need to
be replaced, the replacement unit
would be as accurate as the original
unit. The M77 has absolutely no
moving parts which are often the
VISUAL SIGHTING
RETICLE DEFINES
EXACT AREA OF
TEMPERATURE
MEASUREMENT
INVALID
READING
EYEPIECE
QUICK
DISCONNECT
CONNECTOR
M77LS
REAR
PANEL
SLOPE
ADJUST
FOCUS
2

How to Select an
M77 Sensor Head
Since there are three M77 models (M77, M77S, M77LS)
as described on the previous page, it is first necessary to
determine which model you require:
a. M77 – Fixed focus
b. M77S – Variable focus, see through lens
c. M77LS – Variable focus, see through lens for
laboratory and research applications.
After choosing the desired model follow these 4 steps.
1. Select the temperature range and units (C or F) from
ranges listed. Insert ranges and units in Box 1 ,
filling in all blanks with zeros.
2. Place letter “R” or “R1” in Box 2 for standard
spectral response.
3. Select signal output; (L) for standard 4-20mA linear,
or (U) for others and insert in Box 3 .
4. Select the correct operating distance.
a. If you selected the M77 fixed focus model, specify
the desired focus distance in writing (See Table 1.)
and enter “U” in Box 4 .
b. If you selected the focussable M77S or M77LS
read the section “Optical Resolution” below. Then
choose the desired operating distance and insert the
corresponding Code No. in Box 4 .
EXAMPLE
The model chosen for the instrument indicated in the
selection chart is the focussable M77S with through
lens sighting for a temperature range of 800° to 1800°C
with spectral response of two narrow bands, with
4-20mA linear output and a focussable operating
distance of 350mm (14”) to infinity.
Optical Resolution
Three different lenses are available for the M77S. The
one you should choose depends on the desired working
distance of the unit. The first version is designed to
measure temperature at distances of 350mm (14”) to
infinity. The second version has a working area of
150mm (6”) to 350mm (14”). The third version is fixed
to measure temperatures at a 50mm (2”) distance.
Proper focussing is achieved by mounting the unit at
the desired distance and adjusting the focussing knob
on the rear panel of the instrument until the target
comes into clear view in the reticle. When the target is
in focus to the eye, it is also in focus to the detector.
Should you wish to move the instrument, remember to
stay within the prescribed working distance, and simply
refocus upon the target after mounting the instrument
in its new location.
A typical field of view diagram is shown below.
Minimum Target size determined by the formula:
Minimum Target Size (d) =
TARGET SIZE (d)
Focussed Distance (D)
Field of View Ratio
DISTANCE (D)
Example: M77S, version 1 with 30:1 FOV focussed at
381mm (15”)
D 381
Minimum Target Size(d) = = = 12.7mm
FOV 30
15”
(or = = 0.5”)
30
Selection Chart
M77S 0 8 0 0 – 1 8 0 0 C R L
3
1
1 TEMPERATURE RANGE
3
FIELD OF
VIEW RATIO
°C °F
350-800 660-1500
550-1200 1025-2200 15:1
600-1400 1100-2500
400-1000 750-1800
650-1400 1200-2500
30:1
450-1200 850-2200
700-1400 1300-2500
700-1700 1300-3100
700-2000 1300-3600
800-1800 1500-3300
60:1
800-2300 1500-4100
900-1600 1800-3200
500-1400 950-2550
1000-2500 1800-4500
1000-3000 1800-5400
1100-2200 2000-4000 90:1
1200-3200 2200-5800
1200-3500 2200-6500
Notes:
1. Special temperature ranges are available upon request.
2. See table 1 for availability of focus distances for FOV selection.
3. Some 90:1 FOV temperature ranges are also available with a 180:1 FOV.
Please consult Mikron.
TABLE 1 – M77
MINIMUM TARGET
Field of Fixed Focus
View No Sighting
Ratio
15:1 D/15
30:1 D/30
60:1 D/60
90:1 D/90
180:1 D/180
Consult Mikron
MINIMUM
FOCUS
DISTANCE
2”
2”
6”
6”
14”
Table 2 – M77S, M77LS Minimum target sizes are
shown in the table below
Field of Version 1 Version 2 Version 3
View Focus 14” Focus 6” Focus at
Ratio to Infinity to 14” 2”
15:1 23.6mm (0.93”) 10.2mm (0.40”) 3.3mm (0.13”)
at 350mm (14”) at 150mm (6”) at 50mm (2”)
30:1 12mm (0.47”) 5mm (0.20”) 1.5mm (0.06”)
at 350mm (14”) at 150mm (6”) at 50mm (2”)
60:1 6mm (0.24”) 2.5mm (0.10”)
at 350mm (14”) at 150mm (6”)
N/A
90:1 4mm (0.16”) 1.8mm (0.07”)
at 350mm (14”) at 150mm (6”)
N/A
2
2 SPECTRAL
RESPONSE
CODE
R1
R
R1
R
R1
TWO
NARROW
BANDS R
NEAR
INFRARED
R1
OUTPUT
4-20mA
Linear
CODE
L
1
3 4
4 OPERATING
DISTANCE
(See note 2)
CODE
350mm
(14”) to 1
infinity
150mm
(6”) to
350mm
(14”)
50mm
(2”) fixed
How to Select an M78 Sensor Head
The selection process for the M78 is similar to that of the M77, with the
additional requirements of the fiber optic feature. The selection steps are as follows:
1. Select the temperature range and units (C or F) from ranges listed. Insert
ranges and units in Box 1 , filling in all blanks with zeros.
2. Place letter “R” or “R1” in Box 2 for standard spectral response.
3. Select signal output; (L) for standard 4-20mA linear, or (U) for others and
insert in Box 3 .
4. Select the length of fiber optics cable and insert code number in Box 4 .
5. Select the required lens assembly from the field of view diagrams and insert
code number in Box 5 . If, however, an extension tip is to be used, the code
number inserted in Box 5 should be selected from the chart under Rigid
Extension Tip; both stainless steel and ceramic tips are available.
2
3

Selection Chart
C or F
M78 0 8 0 0 – 1 8 0 0 C R L
S 1 2 0 3 0 S
1
2 3 4
5 or
1 TEMPERATURE RANGE
See note 1
°C °F
450-1200 850-2200
450-1200 850-2200
500-1400 950-2550
600-1800 1100-3300
700-1400 1300-2500
700-1700 1300-3100
700-2000 1300-3600
800-1800 1500-3300
800-2300 1500-4100
900-1600 1800-3200
1000-2500 1800-4500
1000-3000 1800-5400
1100-2200 2000-4000
1200-3200 2200-5800
1200-3500 2200-6500
FIELD
OF
VIEW
RATIO
3:1
15:1
30:1
30:1
15:1 or
30:1
30:1
90:1
MAX. FIBER
OPTIC
LENGTH
180cm (6’)
180cm (6’)
180cm (6’)
180cm (6’)
For 15:1 –
900cm (30’)
For 30:1 –
180cm (6’)
900cm (30’)
900cm (30’)
See note 4
2 SPECTRAL
RESPONSE
CODE
TWO
NARROW
BANDS
NEAR
INFRARED
R1
R
3 OUTPUT
CODE
4-20mA
L
4 FIBER OPTIC
CABLE
LENGTH
CM FT. CODE
90 3 S03
180 6 S06
360 12 S12
540 18 S18
720 24 S24
900 30 S30
Special Length
– Customer to
Specify Length
in Writing
SXX
5 STANDARD
FOCUS LENS
ASSEMBLY
See note 2
FOV
CODE
15:1 015S
30:1 030S
90:1 090S
NON-
STANDARD
FOCUS
See note 3
15:1 015U
5
RIGID
EXTENSION TIPS
See note 5
STAINLESS CERAMIC
STEEL
LENGTH CODE LENGTH CODE
76mm S033 76mm C033
(3’) (3’)
152mm S063 152mm C063
(6’) (6’)
305mm S123 305mm C123
(12’) (12’)
610mm S243 24mm C243
(24’) (24’)
30:1 030U
FOV RATIO
15:1
TARGET DISTANCE IN.
0
Min.
TARGET DIA. IN. 0.4
Focussable
Distance:
5.0cm TARGET DIA. CM
1.0
(2.0”)
TARGET DISTANCE CM
0
30:1
Min.
Focussable
Distance:
12.7cm
(5.0”)
90:1
Min.
Focussable
Distance:
12.7cm
(5.0”)
Standard Lens Assembly
0
TARGET DISTANCE IN.
TARGET DIA. IN. .40
TARGET DIA. CM
0
TARGET DISTANCE CM
0
0
TARGET DISTANCE IN.
TARGET DIA. IN. .40
TARGET DIA. CM
1.0
TARGET DISTANCE CM
0
FIELD OF VIEW DIAGRAMS
15
1.0
2.5
38
30
1.0
2.5
76
90
1.0
2.5
230
30
2.4
6.1
76
60
2.5
6.0
150
180
2.5
6.0
460
EXAMPLE
The model number for the M78 “Infraducer” indicated in the boxes
designates a unit with a temperature range of 800° to 1800°C with a
4-20mA linear output using 360cm (12’) length of fiber optics cable,
a standard lens assembly with an FOV ratio of 30:1 focussed at
760mm (30”).
Notes:
90:1 090U
1. Special ranges are available upon request.
2. All standard focussing distances match their respective FOV
distance, i.e. 30:1 = 30”.
3. When non-standard focus distance is desired, such as close focus,
insert code “U” instead of “S” and describe desired focus distance
in writing.
4. Longer length fiber optic available upon request.
5. All Rigid Extension Tips provide a 3:1 FOV
6. Minimum focus distance for standard lens assembly is 2” for 15:1
FOV and 5” for all others.
7. 6’ fiber cable max. Consult factory for any other configurations.
CLOSE FOCUS FOV*
FOV RATIO 15:1 FOV RATIO 30:1 FOV RATIO 90:1
CODE 015U CODE 030U CODE 090U EXTENSION TIP FIELD OF VIEW (3:1)
D
dø
20°
Tip
*Min Target Size (d) =
Focussed Distance (D)
FOV Ratio 20°
1.5 (.06)
EXTENSION TIP ASSEMBLY
3Ø
(.125)
13
(.50)
64
(2.50)
19
(.75)
13
(.50)
LENGTH
1/2-20 THD 3/4-16 THD
(2) JAM NUTS
LENS ASSEMBLY
All mounting hardware is supplied by Mikron
114
(4.50)
76
(3.00)
(2) JAM NUTS
STAINLESS STEEL
FLEXIBLE FIBER OPTICS
CABLE (50 (2.00) MIN.
BEND RADIUS)
LENGTH
193
(7.61)
M78 SENSOR HEAD
51
(2.00)
Four Holes
5 (0.200)
MOUNTING BLOCK
64
(2.50)
25
(1.00)
All dimensions are mm (in.)
4

How to Select an
M77E/77EM Electronics
Step No.
A. Insert in box “A” the basic model. Select either
M77EM for a single electronics processor or M77E
if a complete control package is required.
B. Select the desired control function and insert code
no. in box “B”.
C. Specify the supply voltage and insert code no. in
box “C”.
D. Designate the desired auxiliary code no. in box “D”.
EXAMPLE
An M77E electronics with current proportioning 3 mode PID
digital controller with 4-20mA output. Supply voltage of
120VAC with option of automatic tuning.
A
BASIC B CONTROL FUNCTION
MODEL (M77E ONLY) CODE
M77EM
Processor
M77E
Processor/
Controller
A
None
(Mandatory with M77EM) 00
Digital Indicator Only
On-Off or Time Proportioning
3 mode indicating controller
Current Proportioning
3 mode controller with 4-20mA output
Position Proportioning
3 mode indicating controller
Time Proportional Duplex
with two time proportioning outputs
Current Proportioning Duplex
with two current proportioning outputs
Current/Relay Duplex
(Relay = Heat)
Current/Relay Duplex
(Relay = Cool)
M77E D 9 1 1
C
SUPPLY
VOLTAGE
C
CODE
120VAC 1
240VAC 2
100VAC 3
D
D
B
CONTROL OPTION
NONE (MANDATORY
WITH M77EM)
D1
D7
D9
D4
D5
D6
D8
D2
CODE
AUTO TUNE 1
REMOTE SET POINT 2
AUXILIARY OUTPUT 3
RS422
COMMUNICATIONS LINK
DIGITAL INPUT 5
SET POINT RAMP/SOAK
PROGRAMMING
0
4
6
General Specifications
M77/78 Sensor Heads
Accuracy: ±0.5% of full scale for temperature below 3200°F
(1700°C); ±0.75% of full scale for temperature scales above 3200°F
(1700°C)
Resolution: ±0.10% of full scale span (FSS)
Repeatability: ±0.25% of full scale span (FSS)
Output: 4-20mA linear standard
Slope Adjust: Adjustable from .85 to +1.15. Field switchable to
Tungsten Lamp characteristic.
Input Voltage: ±15VDC regulated 200mA min. (External supply
available from Mikron 77E/77EM or a separate power supply.)
Load Resistance: 500 ohms max. for 4-20mA
Input Signal Reduction: Up to 95% of reduction in incoming
radiation can be tolerated due to low emissivity, target size
reduction or obscuration for temperature above 1500°F (815°C).
Response Time: 40mS to 10 sec. field adjustable. Response time
defined as time required for output to reach 95% of its final value.
Electrical Connections: Compression type for M77, M77S and
M78. Quick disconnect for M77LS.
Operating Ambient Temperature: A) Model M77 and M78
sensor head. Without Cooling Jacket: 32 - 120°F (0 - 50°C). With
Cooling Jacket: Up to 600°F (315°C). B) Model M78 lens and tip
assembly. Without Cooling Jacket: 32 to 600°F (0 to 315°C). With
Cooling Jacket: Up to 900°F (480°C).
Material: Stainless steel.
Weight: 2 lbs. (0.90kg)
Mounting: Support block with four .200” (5mm) dia. holes and
“U” clamp. For more secure mounting use of protective jacket is
recommended.
M77/78E/EM Electronics
Input Signal Requirements: From M77 or M78 of same
tem-perature range 4-20mA (linear)
Slope Adjust: .85 to 1.15
Response Time Adjust: 40mS to 10 sec. Field adjustable.
Peak Picker Decay Rate: (Valley Picker optional) Continuously
adjustable between 0.01 and 10% of full scale/second
Peak Picker Controls: (Valley Picker optional) On, Cancel and
Reset from front panel. Remote Reset actuated by external SPST
switch (customer supplied).
Standard Outputs (Linear): 0-1V Full Scale; 0-50mVDC Full
Scale; 1mV/°F or C; 4-20mADC, 650 ohms max.
Optional Outputs (specify one): In lieu of 0-1VDC or 1mV/°,
0-5VDC full scale; or 0-10VDC full scale
Output Supply Voltage: ±15VDC regulated 200mA min. to power
M77/78 sensor heads
Ambient Temperature Range: 0°C to 50°C (32°F to 120°F)
Size: Front outline M77E: 160mm x 128mm (6.5 in. x 5.0 in.) Front
outline M77EM: 64mm x 128mm (2.5 in. x 5.0 in.)
Depth Behind Panel: 230mm (9.0 in.)
Panel Cutout: M77E: 154mm x 108mm (6.062 in. x 4.25 in.)
M77EM: 57.1mm x 108mm (2.25 in. x 4.25 in.)
Electrical Connections: Compression type at rear of instrument
— behind rear cover
Peak Picker Outputs: (Valley Picker optional) All standard
outputs are routed through peak picker.
Electrical Connections: Compression type terminals
Conduit Knockout: 4 holes - 22mm (.875 in.)
Controller (M77E only)
Physical Description: Housed in a metal case in a 1/4 DIN
cutout. Modular construction of the plug-in chassis allows easy
access to the controller board and its various option boards. All
power, input, and output wiring are connected to screw terminals
on the rear terminal panel.
Digital Displays: Vacuum fluorescent, alphanumeric. A six digit
display dedicated to the process variable. Alternate information
displayed during configuration mode. An eight digit display shows
key selected operating parameters. Also provides guidance during
controller configuration.
Note 1: Accuracy is stated for targets having grey body
or tungsten lamp characteristics.
Note 2: Certificate of NIST traceability will be provided
upon special request.
5

M77EM
M77EM CUTOUT
7.84
(200)
6.86
(174)
1.75
(45)
M77/M77S SENSOR HEAD
INVALID
READING
EYEPIECE
2.00
(51)
SLOPE
ADJUST
FOCUS
OUTPUT
CONNECTOR
5.04
(128)
2.52
(64)
7.75
(198)
1.4
(36)
4.25
(108)
2.12
(54)
1.14
(29) 2.28
(58)
6.62
(168)
.62
(16)
INVALID
READING
2.00
(51)
SLOPE
ADJUST
CONTROLLER
M77E
PROCESSOR
M77E CUTOUT
4.12
(105)
1.00
(25.4)
1/4 -20
(2) MOUNTING HOLES
M77LS SENSOR HEAD
WITH LABORATORY STAND
EYEPIECE
1.50
(38)
2.00
(51)
FOCUS
OUTPUT
CONNECTOR
5.04
(128)
4.250
(108)
2.125
(54)
DIMENSIONS IN INCHES (MILLIMETERS)
6.3
(160)
3.031
(77) 6.067
(154)
Indicators: Alarm Relay Status (ALM 1
or 2), Control Mode (A or MAN), temperature
Units (F or C), Remote Set Point
Active (RSP), Control Relay Status (OUT
1 or 2), Set Point Program RUN or HOLD
(R or H).
Bargraph: 21 segment, color coded
Deviation bargraph —
GREEN = On control
RED = Deviation to ±10% of PV span
Modes of Operation: Manual, Automatic
with local set point, Automatic with
remote set point (2-input units only).
Configurable Parameters and
Setting Range or Selection
(a) Tuning
Gain or PB(%): 0.1 to 999.9
Rate: 0.08 to 10 minutes
Reset: 0.02 to 50.00 minutes/repeat
or repeats/minute
Manual: -100 to 100 (% of Output)
Cycle Time: 1 to 120 seconds
Lockout: None to Maximum
(b) Set Point Ramp
Time: 0 to 255 minutes
Final Set Point: Within the set point
limits
(c) Auto Tune
Step Size: -105 to 105 (% of Output)
(d) Algorithm
Control Algorithm/Output Algorithm:
On-Off, PID-A, PID-B, PD + MR, 3
Position Step/Time Proportional
simplex or duplex, Current Proportional
simplex or duplex, Position
proportional, Current-Relay duplex
(relay = Heat or Cool)
Relay Contact Ratings: Resistive
Load: 5 amperes at 120VAC, 2.5 amperes
at 240VAC. Inductive Load: 50VA at
120VAC or 240VAC
Inputs: 0 to 1VDC from M77EM.
A second input provides a remote set
point function and accepts a 4 to 20mA
or a 1 to 5VDC range that can be
characterized.
Control Algorithm: Depending on
the control output type specified, the
controller can be configured for the
following control algorithms: On-Off,
PID-A, PID-B, PD with Manual Reset,
Three Position Step Control
Outputs: The controller is available
with one of the output types listed below:
Time Proportional: Provides On-Off
or Time Proportional (Relay) output.
Current Proportional: Supplies
proportional direct current output for
final control elements which require a
4-20mA signal.
Position Proportional: Positions
a reversible motor with a feedback
slide-wire in proportion to the output
of the control algorithm.
Time Proportional Duplex:
Depending on which control algorithm
you select, can provide On-Off Duplex,
Time Proportional Duplex, or 3 Position
Step Control. The time proportional
duplex output provides independent
PID tuning constants and two time
proportional outputs: one for heat zone
above, and one for the cool zone below
50% output.
Current Proportional Duplex:
Similar to current proportional but
provides a second set of tuning parameters
and a second current output via the
Auxiliary output option, for the heat and
cool zones.
Current Relay Duplex (Relay =
Heat): A variation of Duplex with
Current active for 0 to 50% output
(Tuning Set 2) and Relay active 50
to 100% output (Tuning Set 1).
Current/Relay Duplex (Relay =
Cool): A variation of Duplex with
Current active for 50 to 100% output
and Relay is active for 0 to 50% output.
Configuration: You decide how the
controller is to interact with the process
by selecting, through simple keystrokes,
the functions you want. Internal programs
prompt the operator step-bystep
through the configuration process
assuring quick and accurate entry of all
configurable parameters.
Control Modes: Manual or Automatic
control with bumpless, balanceless
transfer between modes is a standard
feature. In the manual mode, the
6
operator directly controls the controller
output level. In the automatic mode, the
controller will operate from a local set
point, or a remote set point at the second
input.
Alarms: One or two alarm relays are
available to activate external equipment
when preset alarm set points are
reached. Each of the two alarms can
be set to monitor two independent set
points. Each set point can be a high
or low alarm. The alarm type can be
selected to be either of the inputs, the
PV, Deviation, Output, or Shed from the
communications. It can also be used as
an On or Off event at the beginning or
end of a Ramp/Soak segment.
Optional Features
Auto Tune: When enabled, this feature
will automatically calculate and enter
into memory the optimum tuning
parameters required for your process.
A “Short Tune” feature lets you obtain
approximate tuning constants.
Remote Set Point: Isolated high level
input available for remote set point signal.
Auxiliary Output: Can be scaled
from 4-20mA for 0 to 100% for any
range desired. It can be configured
to represent Input 1, Input 2, PV, Set
Point, Deviation, or the Control Output.
Communications: Provides an
RS422 ASCII communication link to a
host computer permitting reading and
writing data transfer type transactions
to the list of configurable parameters.
Digital Input: Allows remote switch
selection of: Local or Remote set point,
Local set point 1 or Local set point 2,
Manual or Automatic control mode, Direct
or Reverse controller action, reset of
Limit Controller, or Run or Hold of
Set Point programming function.
Set Point Ramp/Soak Programming:
Enables you to program and store
6 Ramp and 6 Soak segments for set
point programming. Run or Hold of
program is keyboard or remote switch
selectable.

Support Electronics —
A Complete Process Control Package
M77 Electronics
Completing the total M77/M78 Infrared Temperature
Measurement System is the auxiliary electronics
module. Two different packages are available, both
of which include a variety of signal outputs.
M77EM
Electronics Processor
The Mikron 77EM provides remote
adjustment of slope and peak/
valley picker with adjustable decay
rate. Maintenance adjustments,
though not directly exposed, are
easily accessible when needed.
A variety of signal outputs are
provided as standard.
steam or machinery
• When the hottest or coldest temperature of a large
piece is desired
M77 Control System
The M77E Electronics is an integrated system with the
versatility to meet any control application. It is a
combination of the M77EM processor and an exceptionally
versatile microprocessor based controller which
offers outstanding features. See pages 5 and 6 for details.
Peak/Valley Picker
The peak/valley picker circuitry
allows a fast system response to
temperature change with adjustable
slow decay of output. This
feature is invaluable in applications where wide temperature
variations are encountered, such as:
• When hot moving objects are separated by cool spaces
between them
• When line of sight of sensor head intermittently or
periodically is obstructed by such things as smoke,
Applications
The unique features of 2-color
infrared thermometry make the M77/78
“Infraducers” ideal for a wide range of
temperature measurement and control
applications above 250°C (500°F). These
include metal melting operations, heat
treating, ore smelting, wire and rod
forming, vacuum furnaces, ceramic kilns,
induction heating and crystal growing.
Two applications are illustrated at right.
Fig. 1
Fiber Optics
Lens Assembly
M78
Infraducer
Figure 1:
Induction Heating
The illustration indicates how the M78,
with its fiber optic feature, can be used
at multiple locations along the length of
the object being heated to measure the
temperature at critical points to assure
uniformity of treatment.
Figure 2:
Vacuum Melting
In vacuum furnaces often sighting through
a window is difficult or undesirable. In
this application a fiber optic lens assembly
is placed inside the vessel, using a vacuum
bushing. Since the M78 is independent of
emissivity it is also ideal for direct sighting
temperature measurement of molten metal
in other metal furnace applications.
7
Fig. 2
Fiber
Optics
Cable
M78
Infraducer
Vacuum or
High Pressure
Bushing

Accessories
Protective Jacket
This NEMA 4 rated cast aluminum
jacket and end cap protect the sensor
head from physical damage in heavy
industry environments and dampen
the effect of rapid ambient changes.
The jacket features a quickly removable
end cap which provides easy
access to the eye piece and focussing
knob without disturbing the electrical
connections. In ambients exceeding
the maximum rated temperature of
the sensor head, a protective cooling
jacket is mandatory. While air flow
alone is sufficient for light cooling,
water must be used for moderate and
heavy cooling.
To order: Specify Part No. 11609-7
for protective jacket. Specify Part
No. 11609-8 for protective cooling
jacket.
Air Purge Assembly
This assembly performs two important functions - purging and localized cooling.
Air purging of the optics is extremely important when airborne contaminants can
build up on the lens and eventually “blind” the sensor head.
The Mikron air purge assembly has been carefully engineered to prevent
contaminant build up. A flow of only 75 CFH (2 CMH) of normally clean industrial
air will keep the optics clean under most conditions.
The cooling plate section of the air purge assembly allows the coolant to
circulate in a stainless steel chamber which cools the sensor head up to an
ambient temperature of 250°F (120°C) using 10 gallons/hour (38 liters/hour).
To order: Specify Part No. 11524-L.
.50 (13) ø
(4) MOUNTING HOLES EQ. SP.
ON A 4.7500 (121) Ø B.C. 1/8 NPT
COOLANT IN
6.00 ø
(152)
2.31 ø
(59)
3.00
(76)
.45
(11)
1.00
(25)
AIR PURGE ASSY
14.35
(364)
5.60
(142)
1/8 NPT
COOLANT IN
1/8 NPT
COOLANT OUT
3.25
(83)
REMOVABLE CAP
OUTPUT
CABLE
REMOVABLE
CAP
1.90 ø
(48)
2.81 ø
(71)
2.88 ø
(73)
MOUNTING
BRACKET
COOLANT IN
(JACKET)
COOLANT OUT
(ADDITIONAL)
AIR PURGE
ASSEMBLY
SPRING LOADED
AIMING FLANGE
MOUNT
COOLANT
OUT
(JACKET)
PROTECTIVE
COOLING
JACKET
COOLANT IN
(ADDITIONAL)
SIGHT TUBE
AIR
PURGE
IN
NOTES
1. ALL CASTINGS AND FLANGES ARE
ALUMINUM UNLESS OTHERWISE SPECIFIED
2. ALL HARDWARES ARE STAINLESS STEEL
3. ALL DIMENSIONS ARE IN INCHES (MM)
AIR PURGE
SIGHT TUBE
MOUNTING FLANGE
ADJUSTABLE SPRINGS
ANGLE OF
ADJUSTMENT
(X-Y) AXIS
Aiming Flange Assembly
Used in installations requiring mounting of
the sensor assembly while allowing adjustment
of the optical path to a maximum of 5
degrees in any direction.
To order: Specify Part No. 11649-2.
A protective cooling jacket and air purge
assembly for the M78 fiber optic unit is
shown below.
To order: Specify Part No. 12220-1.
10˚
1/8 NPT AIR
PURGE IN
1/8 NPT
COOLANT OUT
PROTECTIVE JACKET
COOLING (OPTIONAL)
1.94
1.50
(49)
(38) 1/2 NPT
2.50
(63)
OUTPUT CABLE
BUSHING
9.41
(239)
1/4 - 20 TAP X .375 DP.
(2) HOLES
MOUNTING SURFACE
Fiber Optic Target
Illuminator (Optional)
Mikron offers a fiber optic illuminator
for precision illumination
of the target areas when used in
conjunction with fiber optics and
lens assembly.
To order: Specify Part No.
12110-1A for 115VAC.
Specify Part No. 12110-2B
for 220VAC.
Power Supplies
A low profile, sealed and rugged package
suitable for chassis mounting. The
front-mounted terminal barrier strip is
perfect for isolation between input and
output voltages. A current limiting feature
protects the power supply when
short circuit occurs. Four tapped holes
are provided for mounting.
Output Voltage: ±15VDC, 300mA max.
Operating Temperature: -15 to 160°
F(-25 to 70° C).
Dimensions: (W x H x D) 2.5” x 1.56”
x 3.5” (64 x 39 x 107mm)
To order: Specify Part No. 11846-6
for 115VAC input. Specify Part No.
11846-7 for 220VAC input.
(48)
AIR
1.9
DIA.
OUT
inches (mm)
1.00
(25)
.40
(10)
COOLANT
OUT
PURGE AIR IN
COOLANT IN
7.81 (198)
PROTECTIVE CAP
FIBER OPTIC CABLE
ADJUSTABLE FLANGE MOUNT (OPTIONAL)
PROTECTIVE
FLEXIBLE HOSE
.50 INSIDE
DIAMETER
(OPTIONAL)
Made in U.S.A. The M77/78 Series are designed and manufactured in the U.S.A.
ISO 9001