PACKAGE : I Bid Document VOLUME : II - Public Health Engineering
PACKAGE : I Bid Document VOLUME : II - Public Health Engineering
PACKAGE : I Bid Document VOLUME : II - Public Health Engineering
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The contact configuration of pressure switches shall be DPDT type for each set<br />
point/position contact rating shall be 5A/230V AC & 0.2A/220V DC minimum.<br />
Set points shall be adjustable through out the range with a calibrated scale indicator<br />
set point. Switching differential shall be adjustable.<br />
Flow meter/sensor<br />
The flow sensor is to be installed & commissioned to measure the instant rate as<br />
well as totalized flow for a period of time passing through the header pipe. The flow<br />
meter shall be electromagnetic type. The sensor shall be full bore type installed U/G<br />
in the masonry pit. One flow stabilizing pipe of length 20D at the U/S & 5D at the<br />
D/S of the flow sensor shall be provided. The minimum & maximum flow rate that<br />
the sensor can measure shall be clearly spelt out & shall match with the scheme<br />
requirement & the offered pump discharge capacity working on safe operating zone.<br />
The indicator shall read the flow rate in M 3 /hr scale & the totalizer shall indicate the<br />
total flow in M 3 . The indicator & totalizer shall be installed within the room meant<br />
for electric control and shall either be housed centrally within the LT Panel Board<br />
or in a separated wall mounted panel. The flow sensor shall be suitable for PN 1.0<br />
pressure rating. The flow sensor shall be powered as necessary from the LT Panel<br />
Board through PVC Control Cable described elsewhere. If the flow meter demand<br />
for any signal conditioner/amplifier and/or Power Converter etc. the same shall be<br />
provided with the unit. Since the sensor pit may not be 100% water proof the sensor<br />
with terminal connections shall be suitable for prolonged submergence companion<br />
flanges as per sensor unit shall be provided with the stabilizing pipes. The accuracy<br />
of the flow sensor shall be within ± 1% of the full scale. The <strong>Bid</strong>der shall submit the<br />
data sheet of the Flow meter duty filled in<br />
Alarm Annunciation System:<br />
Audio visual Alarm annunciation system shall be provided as per relevant IS<br />
specification. System shall include panel mounted facia comprising of LED array<br />
assemblies, sets of alarm accept, reset & test push buttons panel mounted audible<br />
devices etc. Facia shall be visible from a minimum distance of 3 meter.<br />
Relays:<br />
Relays shall be electro magnetic type miniature plug-in or DIN rail mounted. The<br />
coil voltage of the relays may be 240V AC/24V DC (appropriate voltage source to<br />
be arranged by the <strong>Bid</strong>der). LED shall be provided at coil for indication.<br />
The contact type of relays shall be 2 NO + 2 NC (minimum) having contact rating<br />
of 5A/230V AC and 0.25A/220V DC. Additional contact shall be provided as per<br />
requirement.<br />
DTS : Detailed Tender Specification. Page 202
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