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Keterangan

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.±20¼V
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 ¼A 20¼V
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 ¼A/V 2¼A/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
ORDER CODE:
HD978TR3 Configurable signal converter amplifier with 4÷20mA (20÷4mA)
output.
Input measuring range –10..+60mV. Default setting 0÷20mV.
Minimum measuring range 2mV.
HD978TR4 Configurable signal converter amplifier with 0÷10 (10÷0Vdc) output.
Input measuring range –10..+60mV. Default setting 0÷20mV.
Minimum measuring range 2mV.