Download - Nivelco Process Control Co., Inc.

THERMOPOINT multipoint temperature transmitterMultipoint temperature transmittersfor liquids and solidsIn an expansion to the THERMOCONT model range wellknownin our home-market, NIVELCO introduced theTHERMOPOINT multipoint temperature transmitter in Aprilof 2010. The first model, the plastic coated flexible probetype, is called a silo-thermometer. Monitoring of the totalvolume of the silo containing grains of various kinds isneeded to provide information on accidental quality loss orthe appearance of germs or fungus. Eventual temperatureincreases will alert the operator to perform further operationsor recycling the medium. Temperature measurement isdone by electronic temperature sensors placed at equaldistances in a coated stainless steel flexible tube.Each sensor sends the actual measured temperature of itsenvironment to the transmitter head. The transmitter headcommunicates with control room devices using the HARTprotocol. The output is 2-wire, the communication is digital.The measured values are transmitted for further processingthrough HART.A maximum of 15 transmitters can beconnected to one HART loop (only 4 incase of Ex transmitters) allowing themonitoring of up to 225 temperaturesensors incorporated into 15 probes.If a system needs more sensors than225 sensing points, furtherMultiCONT units (max. 30) can be organisedin chain using the RS485 interface,therefore even 6750temperature sensors can handled ina single measurement system.Up to 15 digitally addressable semi-conductor temperaturesensors can be placed into a single probe. Measurementvalues of the 15-point sensor can be displayed in aSAP-300 plug-in display unit located on the probe head,or in a MultiCONT process controller screen, in tabularform. The MultiCONT units are also able to display a temperaturechart to indicate the time-trend of the measuredvalues. The greatest advantage of a measurement systemusing THERMOPOINT temperature transmitters is thatother transmitters from NIVELCO (for example: MicroTREKor EchoTREK) can be connected to the same HART loop,expanding the system with level measurement.The HART capable transmitters can beconnected with a UNICOMMSAK-305 communication module or aMultiCONT multichannel processcontroller to transmit the measurementdata from the sensors to a PLC or a PC.The THERMOPOINT product familyhas recently been further expandedwith rod and cable probe versions forthe average-temperature measurementof liquids. The instruments are availablein intrinsically safe and Dust-Exversions.16