Programming. HD 788TR1, HD 786TR1, HD 988TR1 and HD 988TR2 are supplied by default with range 0â¦100°C, however the user may set a different range, ...
using leads with the same diameter so as to guarantee the same impedance in each connection. The symbol RL (load) is used to represent any device inserted in the current loop, that is an indicator, a controller, a data logger or a recorder. Programming HD 788TR1, HD 786TR1, HD 988TR1 and HD 988TR2 are supplied by default with range 0…100°C, however the user may set a different range, making use of the following accessories: • continuous power source 7-30V DC, • Pt100 calibrators or set of precision resistances, • precision ammeter with minimum range 0…25 mA, and following the procedure: 1. Connect HD 788TR1, HD 786TR1, HD 988TR1 or HD 988TR2 as shown in Fig. 6 and set the Pt100 calibrator at the required temperature for 4 mA (for example, supposing the range to be set is -50...+200°C, you will set the calibrator at -50°C or alternatively connect an 80.31Ω resistance between terminals 1 and 3 while short-circuiting 1 and 2). 2. Wait 10 seconds until the measurement becomes settled, then keep pressed the programming key for at least 4 seconds, until the LED flashes once and remains lit. When the key is released the LED flashes. 3. Set the Pt100 calibrator at the required temperature for 20 mA (in the example above, set the calibrator at +200°C, or alternatively connect 175.86Ω resistance between terminals 1 and 3 while short-circuiting 1 and 2). 4. Wait 10 seconds until the measurement becomes settled, then press the programming key for at least 4 seconds, until the LED doesn’t flash anymore. Now release the key and the LED flashes twice. At this point the SET POINT procedure is completed. 5. Check that the setting complies with the required specifications, setting the calibrator (or connecting the precision resistances) at the values corresponding to 4 and 20 mA and checking the currant on the ammeter.
The temperature range may be programmed using precision resistances with a fixed value which simulate the value of a Pt100 sensor. For example, the resistance values corresponding to some temperature values are listed below (see Tab. 1).
Fig. 2 Range 0...100°C, output current with relation to temperature.
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