Libratherm Instruments Private Limited
Libratherm Instruments Private Limited
Dahisar East, Mumbai, Maharashtra
GST No. 27AABCL1732A1Z5
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Instrumentation Control Panels

We deal in FLP Enclosure Process Indicator and Transmitter.

Temperature Process Indicator Transmitter With RS485 Output

Temperature Process Indicator Transmitter With RS485 Output
  • Temperature Process Indicator Transmitter With RS485 Output
  • Temperature Process Indicator Transmitter With RS485 Output
  • Temperature Process Indicator Transmitter With RS485 Output
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Approx. Price: Rs 14,500 / NumberGet Latest Price
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Product Details:

Minimum Order Quantity1 Number
Display4 digit - 0.3Inch red seven segment LED . 4 digit each for PTX-3000-T
Connection2 or 3 wire for sensor input, 2 wire for DC supply and 2 x 4-20mA for current outputs,
Cable EntryThrough suitable size gland for supply and input/output.
Enclosure SizeABS plastic IP-65 (120 x 80 x 55) mm.
RangeFull range of the selected input desired measuring range can be chosen from range selection table.
AccuracySoftware linearized to +/-1 oC for thermocouple input and +/-0.1oC for Pt-100 input.
Power Supply24VDC +/- 10% @ 150mA
Current Output One4-20mA proportional to the specified range of the user selected input. (12 bit resolution).
Current Output Two4-20mA proportional to the specified range of the second specified input. (12 bit resolution).
Digital Serial OutputIsolated 2 wire RS485 on MODBUS RTU protocol in SLAVE mode
Isolation4-20mA and RS485 outputs are isolated from DC Power supply.
Loop ResistanceRLmax = 400 Ohms - for each output.
Input SensorJ,K,R,S,B thermocouple or RTD (Pt-100) or mV, mA signal (Input type not listed here can also be

Model Wise Description:

ModelProduct Description
PTX-3000-UProcess Transmitter – with universal input (8 user selectable)
PTX-3000-FProcess Transmitter – with single fixed  input
PTX-3000-TProcess Transmitter – with two same  input 

Libratherm offers micro-controller based Process Transmitter model PTX-3000 for measuring and transmitting the analogue and digital values proportional to the Process Input. This model can accept eight industrial standard universal inputs, which is user selectable using internal DIP switch. For input selection, three options are available, where user  can specify the desired model for a) universal input or b) any of the two fixed inputs or c) any of the single fixed input. Temperature or Process values corresponding to the input is indicated on the display and the corresponding display range is converted to the 2 wire isolated current output of 4-20mA proportional and linearized to the process input.  This linearized signal can be used  for remote measurement and indication. For the dual input model PTX-3000-T, two independent 4-20mA signals are available on three wires.

For interface with PLC or DCS or with any other process controller – the measured and displayed analog input is converted for digital serial communication on RS485 bus with MODBUS RTU protocol in slave mode.
Advantage of RS485 interface:  Providing the feature of RS 485 digital serial interface is advantageous, since the number of wires coming from the various sensors can be avoided and instead, only two wires can be used to interface multiple such PTX-3000 on serial port.  For example, for a large heating system incorporating 16 thermocouples, under conventional method 16 dual core compensating cables will run from the heating system to the control panel, where as  in case of RS485 interface, only two wires will run from the system to the control panel. Another advantage of RS485 interface is that, when to be interfaced with PLC – the additional analogue module is not required, since most PLC accepts RS485 interface on MODBUS RTU protocol.

  • Microcontroller based design.
  • Universal industrial input (user selectable).
  • Isolated 4-20mA proportional and linearized for the selected input.
  • RS-485 MODBUS RTU serial interface. 
  • Bright red LED display.
  • IP 65 ABS plastic enclosure.
  • Operates on 18 to 36VDC.

Additional Information:

  • Item Code: PTX-3000
  • Pay Mode Terms: T/T (Bank Transfer)
  • Port of Dispatch: Mumbai
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Kamlesh Panchal (Managing Director)
Libratherm Instruments Private Limited
No. 401-403, Diamond Industrial Estate, Ketki Pada Road
Dahisar East, Mumbai - 400068, Maharashtra, India
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