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Products > 4-20 mA Electrode Transmitters
4-20 mA Loop-powered Electrode Transmitters

Transmit the Electrode signals to
PLCs, Displays, Controllers, Instruments and Automation Systems
(Ion-selective electrodes, ORP, pH, Dissovled Oxygen and Temperauter electrodes / Sensor)

4-20 mA Loop-powered Electrode Transmitters

Which Electrode Signal Transmitters to Choose?
Single Channel Transmitter
Dual Channel Transmitter
Isolator for Non-Isolated Transmitter
Isolated or Non-Isolated ?
  • Non-Isolated Transmitter
    When choosing a non-isolated transmitter, please make sure receiving device has a ground-free input so that the ground-loops are avoided.
     
  • Isolated Transmitter
    If the receiving device does not have ground-free input, then an isolated transmitter is required to avoid the ground-loops and other interference.
 
Type Input Output Max. Distance Electrode Isolated Mounting Unit Price Ex VAT (GBP)
1-Channel Transmitter: for Ion (Combination electrode or Mono ISE with external Reference)
TRAi-ISE ISE (mV, selectable range) 4 - 20 mA 250 meters 1 x Ion-Selective Electrode Isolated Wall-Mounted 265.00
1-Channel Transmitter: for pH (Combination electrode or Mono pH with external Reference)
TRA-PHF-DIN pH (± 400 mV, 0 ~ 14 pH ) 4 - 20 mA 250 meters 1 x pH Electrode Non-Isolated DIN Rail 115.00
TRA-PHR-DIN pH (± 200 mV, 3.5 ~ 10.5 pH) 4 - 20 mA 250 meters 1 x pH Electrode Non-Isolated DIN Rail

115.00
TRAi-PHF-DIN pH (± 400 mV, 0 ~ 14 pH ) 4 - 20 mA 250 meters 1 x pH Electrode Isolated DIN Rail 145.00
TRAi-PHR-DIN pH (± 200 mV, 3.5 ~ 10.5 pH) 4 - 20 mA 250 meters 1 x pH Electrode Isolated DIN Rail 145.00
TRA-PHF pH (± 400 mV, 0 ~ 14 pH ) 4 - 20 mA 250 meters 1 x pH Electrode Non-Isolated Wall-Mounted 135.00
TRA-PHR pH (± 200 mV, 3.5 ~ 10.5 pH) 4 - 20 mA 250 meters 1 x pH Electrode Non-Isolated Wall-Mounted 135.00
TRAi-PHF pH (± 400 mV, 0 ~ 14 pH ) 4 - 20 mA 250 meters 1 x pH Electrode Isolated Wall-Mounted 165.00
TRAi-PHR pH (± 200 mV, 3.5 ~ 10.5 pH) 4 - 20 mA 250 meters 1 x pH Electrode Isolated Wall-Mounted 165.00
1-Channel Transmitter: for ORP (Combination electrode or Mono ORP with external Reference)
TRA-ORPF-DIN ORP ( -1000~ +1000 mV) 4 - 20 mA 250 meters 1 x ORP Electrode Non-Isolated DIN Rail 115.00
TRA-ORPR-DIN ORP (-0 ~ +1000 mV) 4 - 20 mA 250 meters 1 x ORP Electrode Non-Isolated DIN Rail 115.00
TRAi-ORPF-DIN ORP ( -1000~ +1000 mV) 4 - 20 mA 250 meters 1 x ORP Electrode Isolated DIN Rail 145.00
TRAi-ORPR-DIN ORP (-0 ~ +1000 mV) 4 - 20 mA 250 meters 1 x ORP Electrode Isolated DIN Rail 145.00
TRA-ORPF ORP (-1000 ~ +1000 mV) 4 - 20 mA 250 meters 1 x ORP Electrode Non-Isolated Wall-Mounted 135.00
TRA-ORPR ORP (-0 ~ +1000 mV) 4 - 20 mA 250 meters 1 x ORP Electrode Non-Isolated Wall-Mounted 135.00
TRAi-ORPF ORP ( -1000~ +1000 mV) 4 - 20 mA 250 meters 1 x ORP Electrode Isolated Wall-Mounted 165.00
TRAi-ORPR ORP ( -0~ +1000 mV) 4 - 20 mA 250 meters 1 x ORP Electrode Isolated Wall-Mounted 165.00
1-Channel Transmitter: for Dissolved Oxygen Electrode (Galvanic or Polarographic with Adapter)
TRA-DOG D.O. ( 0 ~ 10 µA ) 4 - 20 mA 250 meters 1 x Dissolved Oxygen Electrode Non-Isolated Wall-Mounted 135.00
TRAi-DOG D.O. ( 0 ~ 10 µA ) 4 - 20 mA 250 meters 1 x Dissolved Oxygen Electrode Isolated Wall-Mounted 165.00
1-Channel Transmitter: for Temperature Sensor (Pt1000 )
TRA-PT1K Temperature ( 0 to 100 °C ) 4 - 20 mA 250 meters 1 x Pt1000 Temperature Sensor Non-Isolated Wall-Mounted 125.00
2-Channel Transmitter: for pH and ORP (Combination electrode or Mono pH/ORP with external Reference)
TRA-PHFO pH (± 400 mV, 0 ~ 14 pH )
+ ORP (± 1000 mV)		 4 - 20 mA 250 meters 1 x pH Electrode +
1 x ORP Electrode		 Non-Isolated Wall-Mounted 235.00
TRA-PHRO pH (± 200 mV, 3.5 ~ 10.5 pH)
+ ORP (± 1000 mV)		 4 - 20 mA 250 meters 1 x pH Electrode +
1 x ORP Electrode		 Non-Isolated Wall-Mounted 235.00
TRA-PHOR pH (± 400 mV, 0 ~ 14 pH )
+ ORP ( 0 ~ +1000 mV)		 4 - 20 mA 250 meters 1 x pH Electrode +
1 x ORP Electrode		 Non-Isolated Wall-Mounted 235.00
TRA-POR pH (± 200 mV, 3.5 ~ 10.5 pH)
+ ORP ( 0 ~ +1000 mV)		 4 - 20 mA 250 meters 1 x pH Electrode +
1 x ORP Electrode		 Non-Isolated Wall-Mounted 235.00
TRAi-PHFO pH (± 400 mV, 0 ~ 14 pH )
+ ORP (± 1000 mV)		 4 - 20 mA 250 meters 1 x pH Electrode +
1 x ORP Electrode		 Isolated Wall-Mounted 265.00
TRAi-PHRO pH (± 200 mV, 3.5 ~ 10.5 pH)
+ ORP (± 1000 mV)		 4 - 20 mA 250 meters 1 x pH Electrode +
1 x ORP Electrode		 Isolated Wall-Mounted 265.00
TRAi-PHOR pH (± 400 mV, 0 ~ 14 pH )
+ ORP ( 0 ~ +1000 mV)		 4 - 20 mA 250 meters 1 x pH Electrode +
1 x ORP Electrode		 Isolated Wall-Mounted 265.00
TRAi-POR pH (± 200 mV, 3.5 ~ 10.5 pH)
+ ORP ( 0 ~ +1000 mV)		 4 - 20 mA 250 meters 1 x pH Electrode +
1 x ORP Electrode		 Isolated Wall-Mounted 265.00
2-Channel Transmitter: for pH and Temperature (Combined / mono pH, Pt1000)                                  
TRA-PHFT pH (± 400 mV, 0 ~ 14 pH )
+ Pt1000 (°C) 		4 - 20 mA 250 meters 1 x pH Electrode +
1 x Temp. Sensor 		Non-Isolated Wall-Mounted 190.00
TRA-PHRT pH (± 200 mV, 3.5 ~ 10.5 pH)
+ Pt1000 (°C) 		4 - 20 mA 250 meters 1 x pH Electrode +
1 x ORP Electrode		 Non-Isolated Wall-Mounted 190.00
Isolator for Non-Isolated Transmitter
TRA-ISO-1 1-Channel Isolator for Loop-Powered Transmitter DIN Rail 50.00
TRA-ISO-2 1-Channel Isolator for Loop-Powered Transmitter DIN Rail 80.00

Place an Order or Enquiry
 
TRA-ISE: 1-Channel Wall-mounted Transmitter for
Ion Selective Electrode Transmitter for Ion


Wall-mounting Industrial Transmitter for Ion-Selective Electrode

Compatible with all types of Ion Selective Electrode (BNC connector), including EAI ISE
  • Dimensions: 115 x 90 x 55 mm (without connectors)
  • Mounting: Can be wall-mounted (4 x M4 screw)
  • Enclosure: ABS, Protection Class: IP 52
  • Connectors:
    One BNC Socket (50 Ohm type ) for Electrode signal Input
    One 2 mm socket for external Reference Electrode
    One 4 to 20 mA Output with cable gland (cables are screwed to the onboard terminals marked "+" and "-".
  • Power Supply: Output loop-powered (12 V DC to 36 V DC)
  • Input range:Onboard selectable settings with rotary switches and trimming potentiometer
  • Input Resistance: typical 1 Tera Ohm (10 exp 12 Ohm)
  • Input Bias Current: typical 0.1 pA (10 exp -13)
  • Load Resistance: must be less than 200 Ohm for 12V and 800 Ohm for 36 V loop-power
  • Transfer Characteristic:
    Converts the selected input range of the Ion concentration to the full output range (4-20 mA).
    The lowest ion concentration gives output of 4 mA;
    The highest ion concentration, gives output of 20 mA

2-Channel Wall-mounted Transmitters for pH and Temperature


Compact wall-mounting Industrial Transmitter for pH Electrode and Pt1000 Temperature Sensor

Two Types available:

1. TRA-PHFT (Full pH range: 0-14 , 0-100 °)
2. TRA-PHRT (Reduce pH range: 3.5-10.5, 0-100 °)

Compatible with all types of pH Electrode (BNC connector) and Pt1000 Sensor (3.5 mm mono audio jack plug), including EAI pH and EAI TS-1000
  • Dimensions: 115 x 90 x 55 mm (without connectors)
  • Mounting: Can be wall-mounted (4 x M4 screw)
  • Enclosure: ABS, Protection Class: IP 52
  • Connectors:
    One BNC Socket (50 Ohm type ) for Electrode signal Input
    One 2 mm socket for external Reference Electrode
    One 3.5 mm socket Pt1000 Temperature sensor Input
    Two 4 to 20 mA Outputs through one cable gland (cables are screwed to the onboard terminals marked as "EL" and "TMP" with "+" and "-" signs.
  • Power Supply: Output loop-powered (12 V DC to 36 V DC)
  • Input Resistance: typical 1 Tera Ohm (10 exp 12 Ohm)
  • Input Bias Current: typical 0.1 pA (10 exp -13)
  • Load Resistance: must be less than 200 Ohm for 12V and 800 Ohm for 36 V loop-power
  • 2 types of Transfer Characteristic are available:
    TRA-PHFT: pH 0-14 to full output range (4-20 mA)
    pH= 0 input gives output of 4 mA;
    pH = 14 input gives output of 20 mA
    TRA-PHRT: pH 3.5-10.5 to full output range (4-20 mA)
    pH = 3.5 input gives output of 4 mA;
    pH = 10.5 input gives output of 20 mA
    Temperature Channel ( Pt1000 Sensor):
    0°C input gives output of 4 mA;
    100°C input gives output of 20 mA
2-Channel Wall-mounted Transmitters for pH and ORP



Compatible with all types of pH and ORP Electrodes (BNC connectors), including EAI pH and EAI ORP

Four Input ranges are available:
1. TRA-PHFO (pH: 0-14 , ORP: ±1000 mV)
2. TRA-PHRO (pH: 3.5-10.5, ORP: ±1000 mV)
3. TRA-PHOR (pH: 0-14 , ORP: 0 ~ +1000 mV)
4. TRA-POR (pH: 3.5-10.5, ORP: 0 ~ +1000 mV))

Isolated models are available, please see above table for detials.

Product label on the image is for illustrative purposes only and may different from the actual product. Due to differences of the input ranges of the product. please see above table for order codes.
  • Dimensions: 115 x 90 x 55 mm (without connectors)
  • Mounting: Can be wall-mounted (4 x M4 screw)
  • Enclosure: ABS, Protection Class: IP 52
  • Connectors:
    Two BNC Sockets (50 Ohm type ) for Electrode signal Inputs
    Two 4 to 20 mA Outputs through one cable gland (cables are screwed to the onboard terminals marked as "EL1"" and "EL2" with "+" and "-" signs.
  • Power Supply:
    Output loop-powered (12 V DC to 36 V DC)
    Optional:External 24 V DC, please contact us
  • Input Resistance: typical 1 Tera Ohm (10 exp 12 Ohm)
  • Input Bias Current: typical 0.1 pA (10 exp -13)
  • Load Resistance: must be less than 200 Ohm for 12V and 800 Ohm for 36 V loop-power
  • Two types of Transfer Characteristic are available:
    Type 1: Full input range to full output range of 4-20 mA
    Type 2: Reduce input range to full output range 4-20 mA

    Type 1:
    pH Channel: FulI input range of pH 0-14 to output (4-20 mA):
      pH= 0 input gives output of 4 mA;
      pH = 14 input gives output of 20 mA
    ORP Channel: FulI input range of ORP(±1000 mV) to 4-20 mA:
      +1000 mV input gives output of 4 mA;
      -1000 mV input gives output of 20 mA

    Type 2:
    pH Channel: Reduce range pH 3.5-10.5 to output (4-20 mA)
      pH = 3.5 input gives output of 4 mA;
      pH = 10.5 input gives output of 20 mA;
    ORP Channel: Reduce input range ORP(0 ~ +1000 mV) to output 4-20 mA
1-Channel Wall-mounted Transmitter Transmitters for pH

Wall-mounting Industrial Transmitter for pH Electrode
 
  • Dimensions: 115 x 90 x 55 mm (without connectors)
  • Mounting: Can be wall-mounted (4 x M4 screw)
  • Enclosure: ABS, Protection Class: IP 52 (NEMA 2/3)
  • Connectors:
    One BNC Socket (50 Ohm type ) for Electrode signal Input
    One 2 mm socket for external Reference Electrode
    One 4 to 20 mA Outputs with cable gland (cables are screwed to the onboard terminals marked "+" and "-".
  • Power Supply: Output loop-powered (12 V DC to 36 V DC)
  • Input Resistance: typical 1 Tera Ohm (10 exp 12 Ohm)
  • Input Bias Current: typical 0.1 pA (10 exp -13)
  • Load Resistance: must be less than 200 Ohm for 12V and 800 Ohm for 36 V loop-power
  • 2 types of Transfer Characteristic are available:
    TRA-PHF: pH 0-14 to full output range (4-20 mA)
    pH= 0 input gives output of 4 mA;
    pH = 14 input gives output of 20 mA
    TRA-PHR: pH 3.5-10.5 to full output range (4-20 mA)
    pH = 3.5 input gives output of 4 mA;
    pH = 10.5 input gives output of 20 mA

Isolated models are available, please see above for details.

Compatible with all types of pH Electrode (BNC connector), including EAI pH

Choose another Transmitter
1-Channel DIN-Rail Transmitters for pH
Very Compact DIN Rail-mounting Industrial Transmitter for pH
  • Dimensions: 80x 70 x 20 mm (without BNC connector)
  • Mounting: Can be wall-mounted on small or large DIN -Rails (Snap-On fixing)
  • Enclosure: ABS, Protection Class: IP 50
  • Connectors:
    One BNC Socket (50 Ohm type ) for Electrode signal Input;
    Two parallel Screw-terminals "R";
    Two Screw-terminals marked "+" and "-" for 4 to 20 mA Output.
  • Power Supply: Output loop powered (12 V DC to 36 V DC)
  • Input Resistance: typical 1 Tera Ohm (10 exp 12 Ohm)
  • Input Bias Current: typical 0.1 pA (10 exp -13)
  • Load Resistance: must be less than 200 Ohm for 12V and 800 Ohm for 36 V loop-power
  • 2 types of Transfer Characteristic are available:
    TRA-PHF-DIN: pH 0-14 to full output range (4-20 mA)
    pH= 0 input gives output of 4 mA;
    pH = 14 input gives output of 20 mA
    TRA-PHR-DIN: pH 3.5-10.5 to full output range (4-20 mA)
    pH = 3.5 input gives output of 4 mA;
    pH = 10.5 input gives output of 20 mA


Isolated models are available, please see above for details

Compatible with all types of pH Electrode (BNC connector), including EAI pH

Choose another Transmitter
Very Compact DIN Rail-mounting Transmitter for pH

Terminals for all types of DIN -Rails transmitter

  • Two parallel Screw-terminals "R"
    (one can be used to extend the reference to multiple transmitters) as reference input additional to the outer metal part of the BNC connector (connected to the screen of the coax cable)
  • Two Screw-terminals marked "+" and "-" for 4 to 20 mA Output. Wrong Polarity will not damage the transmitter and will not cause an electrical shortcut

1-Channel DIN-Rail Transmitter for ORP


Very Compact DIN Rail-mounting Industrial Transmitter for pH

Product label on the image is for illustrative purposes only and may different from the actual product. Due to differences in ranges of the product. please above table for order codes.
  • Dimensions: 80x 70 x 20 mm (without BNC connector)
  • Mounting: Can be wall-mounted on small or large DIN -Rails (snap-on fixing)
  • Enclosure: ABS, Protection Class: IP 50
  • Connectors:
    One BNC Socket (50 Ohm type ) for Electrode signal Input
    Two parallel Screw-terminals "R";
    Two Screw-terminals marked "+" and "-" for 4 to 20 mA Output
  • Power Supply: Output loop powered (12 V DC to 36 V DC)
  • Input Resistance: typical 1 Tera Ohm (10 exp 12 Ohm)
  • Input Bias Current: typical 0.1 pA (10 exp -13)
  • Load Resistance: must be less than 200 Ohm for 12V and 800 Ohm for 36 V loop-power
  • 2 types of Transfer Characteristic:
    TRA-ORPF-DIN: ORP( ± 1000 mV) to full output range (4-20 mA), thus,
    +1000 mV input gives output of 4 mA;
    -1000 mV input gives output of 20 mA

TRA-ORPR-DIN: ORP(0 ~ +1000 mV) to output full (4-20 mA, thus,
0 mV input gives output of 4 mA;
+1000 mV input gives output of 20 mA.

Isolated models are available, please see above for details
Compatible with all types of ORP Electrodes (BNC connector), including EAI ORP
1-Channel Wall-mounted Transmitter for ORP


Wall-mounting Industrial Transmitter for pH Electrode

Compatible with all types of ORP Electrodes (BNC connector), including EAI ORP

Isolated models are available, please above for details.
  • Dimensions: 115 x 90 x 55 mm (without connectors)
  • Mounting: Can be wall-mounted (4 x M4 screw)
  • Enclosure: ABS, Protection Class: IP 52 (NEMA 2/3)
  • Connectors:
    One BNC Socket (50 Ohm type ) for Electrode signal Input
    One 2 mm socket for external Reference Electrode
    One 4 to 20 mA Outputs with cable gland (cables are screwed to the onboard terminals marked "+" and "-".
  • Power Supply: Output loop-powered (12 V DC to 36 V DC)
  • Input Resistance: typical 1 Tera Ohm (10 exp 12 Ohm)
  • Input Bias Current: typical 0.1 pA (10 exp -13)
  • Load Resistance: must be less than 200 Ohm for 12V and 800 Ohm for 36 V loop-power
  • Transfer Characteristic:
    Full input range ORP( ± 1000 mV) to full output range (4-20 mA), thus,
    +1000 mV input gives output of 4 mA;
    -1000 mV input gives output of 20 mA
1-Channel Wall-mounted Transmitter for Dissolved Oxygen (D.O.)


Wall-mounting Industrial Transmitter for pH Electrode

Isolated model is available, please above for detials.
  • Dimensions: 115 x 90 x 55 mm (without connectors)
  • Mounting: Can be wall-mounted (4 x M4 screw)
  • Enclosure: ABS, Protection Class: IP 52 (NEMA 2/3)
  • Connectors:
    One mini DIN Socket for Electrode signal Input
    One 4 to 20 mA Outputs with cable gland (cables are screwed to the onboard terminals marked "+" and "-".
  • Power Supply: Output loop-powered (12 V DC to 36 V DC)
  • Input Resistance: typical 10 kOhm
  • Load Resistance: must be less than 200 Ohm for 12V and 800 Ohm for 36 V loop-power
  • Transfer Characteristic:
    The electrode input current range of 0~10 µA to full output range of 4~20 mA, thus,
    0 µA input gives output of 4 mA;
    10 µA input gives output of 20 mA
  • The Transmitter is designed to work with EAI D.O.Galvanic
TRA-PT1K: 1-Channel Wall-mounted Transmitter for Temperature

  • Dimensions: 115 x 90 x 55 mm (without connectors)
  • Mounting: Can be wall-mounted (4 x M4 screw)
  • Enclosure: ABS, Protection Class: IP 52 (NEMA 2/3)
  • Connectors:
    One 3.5 mm mono Audio Jack plug for Sensor signal Input
    One 4 to 20 mA Outputs with cable gland (cables are screwed to the onboard terminals marked "+" and "-".
  • Power Supply: Output loop-powered (12 V DC to 36 V DC)
  • Load Resistance: must be less than 200 Ohm for 12V and 800 Ohm for 36 V loop-power
  • Transfer Characteristic:
    The full input range of 0°C~100°C to full output range (4-20 mA), thus,
    0°C input gives output of 4 mA;
    100°C input gives output of 20 mA

    Compatible     with all type of Pt1000 Temperature Sensor (3.5 mm mono-audio/jack plug), including EAI TS-1000 Temperature Sensor

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