• UNIQUE PUSH BUTTON CALIBRATION

• RE RANGEABLE WITHOUT A PC

• RTD, TC INPUT

• LED OVER-RANGE INDICATION

• GALVANIC ISOLATION ON TC TYPES

• DRIFT FREE LINEARISATION

Introduction
A simple push button operation, ranges and calibrates the HMT (4 to20) mA temperature transmitter, eliminating the need for soldering links, potentiometers or PC's.
The HMT in-head mounted transmitter incorporates the latest digital technology to ensure accurate drift free linearisation. It connects to an appropriate sensor and converts the output to a linear (4 to) mA output signal, providing a Level of performance at a cost that was not possible with earlier analogue types.
High accuracy and stability coupled with the flexibility of reduced stock holding and the quick and way of bench re-ranging makes the HMT the ideal choice for the majority of temperature sensing requirements.
The HMT is linearised to comply with all common RTDs & Thermocouples.
An on board LED indicates the successful completion of the range programming and also provides an instant indication of sensor health. Calibration Procedure

1. Connect a simulator / calibrator to the input and between 8 & 30 VDC to the output of the HMT.

2. Set the simulator to the desired temperature at 4 mA. Press and HOLD the calibration button until the LED stars to blink.

3. Set the simulator to the desired temperature at 20 mA. Press the calibration button and release. The LED continues blinking and then shuts off confirming that the unit is calibrated.