LTH Electronics

LTH Electronics

Model IET40 - Conductivity Transmitter



Site the instrument where access is possible for calibration. Fit isolating valves if possible to permit removal for inspection. Do not position the sensor where trapped air can collect. Do not force sensor through an opening too small for it. Allow enough space around the sensor for the fluid to circulate and to prevent field distortion (12mm radially, 25mm below). Make sure the calibration resistor is removed from the sensor. The Sensor is Factory Calibrated, check as required. Route the cable away from power lines where possible. Do not over tighten the sensor into the receptacle. Leave sufficient cable for removing the transmitter if required. Terminate the cable screen to Earth to prevent interference.

  • Do not leave long lengths of wire unscreened.
  • Outputs are not isolated from comms, power supply or each other.
  • The DC Supply must not go below 12 V for the Current Output drivers to work properly.
  • The DC Supply must not exceed 30 V to prevent damage to the Sensor electronics.
  • Only use a CE marked power supply unit of the correct current and voltage ratings.
  • Check that the cable gland which is used fully seals against liquid intrusion.
  • Check the top cover gasket and replace if necessary before tightening down the lid.
  • Installation of the IET40 should be made using a multi-core cable to the terminal blocks.
  • Use a cable with enough cores to make all of the required connections.
  • The 15 way D-type connection can be used separately or simultaneously for programming.
  • Serial Communication is via a 4-wire RS485 interface using a Modbus protocol.

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