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HD978TR3 - HD978TR4 Configurable signal converters/ amplifiers with current and/ or voltage output HD978TR3 and HD978TR4 are signal converters/ amplifiers that can be configured using mV input. The mV input signal range can be configured from -10mV to + 60mV through a button, by using the HD778-TCAL simulator and the DeltaLog7 software or a gauge with mV output. HD978TR3 has a 4� 20mA current output. HD978TR4 has a 0� 10Vdc voltage output, with 0� 1Vdc, 0� 5Vdc and 1� 5Vdc outputs available upon request. A led signals the alarm situations and helps the user during the programming phases. The tool is also protected against polarity inversion. The input and the output are electrically isolated so as to eliminate the problems caused by the reciprocal influence of the devices originating in the disturbances caused across the various grounding/ earthing routes. The tool is housed in a 2 DIN module container ( width 35 mm) with normalized connection for 35 mm omega bars. The 4� 20mA current output stage of HD978TR3 is a two-wired passive type and supplies power to the converter through the same current loop. Technical information @ 25° C and 24Vdc INPUT HD978TR3 HD978TR4 Measurement range -10mV � + 60mV which can be configured Default range 0 � 20mV Minimum measurement range 2mV Input impedance > 1 MOhm Speed of conversion 2 measurements per second Precision ± 0.04% F.S.± 20¼ V Functioning temperature -30 � + 70° C Storage temperature -40 � + 80° C Relative humidity 0� 90% RH ( without condensation) OUTPUT HD978TR3 HD978TR4 Type of output ( note 1) 4...20 mA ( or 20...4 mA) two-wired 22 mA, in case of unconnected input 0 � 10Vdc ( 0� 1Vdc, 0� 5Vdc, 1� 5Vdc upon request) Resolution 4 ¼ A 20¼ V Power 9...30Vdc for the 4� 20mA current output 15� 30Vdc ( 4mA) for the 0 � 10Vdc current output, 10� 30Vdc ( 4mA) for the other outputs Protection against polarity inversion 40Vmax Sensitivity to Vcc power voltage variations 0.4 ¼ A/ V 2¼ A/ V Load resistance RLMax = ( Vdc-9) / 0.022 RLMax = 625© with Vcc = 24 Vdc > 10k© Input/ output galvanic isolation 50Vdc ( checked at 250V) Red led Turns on during the programming phase if the input is unconnected or outside the programmed scale. Warm-up time 2 minutes Thermal shift 0.02% F.S./ ° C
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