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DIN Rail DC or AC Voltage Input Signal Conditioners

DC and AC Voltage Input Signal Conditioners


DC and AC Voltage Input Signal Conditioners DRF-VAC DRF-VAC
  • AC/DC Voltage Input Ranges
    from 60 mV to 650 V
  • Accuracy 0.3%
  • Response Time for DC Signals, 70 mS
  • Response Time for AC Signals, 250 mS
  • Over Range Protection for Voltage Inputs
  • High Impedance Voltage Inputs
  • Galvanic Isolation Between Input, Output and Power

The DRF series DIN rail signal conditioners are designed to accept a broad range of input signals, such as ac and dc voltage and current, frequency, temperature (thermocouple and RTD), and process transducers, and provide standard process outputs of either 4 to 20 mA, or 0 to 10 Vdc. The DRF series feature a modern housing design, that is easily mounted on standard 35 mm DIN rails. Connections are safely and securely made through pluggable screw terminal connectors, with input and output connections on the opposite sides of the module.

The DRF-VDC and the DRF-VAC voltage signal conditioners accept dc and ac voltages respectively and provide an isolated 0 to 10 Vdc or 4 to 20 mA output. Models are available with three different power options, 24 Vdc, 120 Vac and 240 Vac.

The DRF-VDC and DRF-VAC are ideally suited for industrial applications. All models mount on a standard 35mm DIN rail and provide galvanic isolation between input, output and power up to 3500 Veff (model specific).

Range Code Table for DRF-VDC and DRF-VAC
Range CodeDRF-VDC RangeDRF-VAC Range
75MV0 to 75 mVdc0 to 75 mVac
150MV0 to 150 mVdc0 to 150 mVac
300MV0 to 300 mVdc0 to 300 mVac
650MV0 to 650 mVdc0 to 650 mVac
1V0 to 1 Vdc0 to 1 Vac
7.5V0 to 7.5 Vdc0 to 7.5 Vac
15V0 to 15 Vdc0 to 15 Vac
65V0 to 65 Vdc0 to 65 Vac
300V0 to 300 Vdc0 to 300 Vac
650V0 to 650 Vdc0 to 650 Vac


Accuracy: <0.2% full scale
Linearity: <0.1% full scale
Thermal Drift: 250 ppm/°C typical
Thermocouple CJC Drift: 0.1°C/°C
Response Time
DC Signal Input Models:< 70 mS (90% of signal)
AC Signal Input Models: <250 mS (90% of signal)
Input Impedance: 1 MΩ for ranges < 1 V, 10 M Ω for ranges > 1 V
Over Range Protection: 1000 V for ranges greater than 100 V, 500 V for ranges less than or equal to 100 V
Max AC Frequency: 1 KHz

Power: 24 Vdc ±10%, 230 Vac ±10% 50/60 Hz, 115 Vac ±10% 50/60 Hz
Power Consumption: <3.8 VA

Output: 4 to 20 mA and 0 to 10 Vdc
Maximum Voltage Output: 11 Vdc approx.
Minimum Voltage Output: -1 Vdc approx.
Minimum Load Resistance (Voltage): >1 KΩ Maximum Current Output: 22 mA approx.
Maximum Current Output: -1.5 mA approx.
Maximum Load Resistance (current): >400 Ω

Electrical Connections: Plug-in screw terminals
Protection: IP-30

(DC Powered Models): 120 g (4.2 oz)
(AC Powered Models): 200 g (7 oz)
(DC Powered models):
110 H x 22.5 W x 93 mm D (4.3 x 0.9 x 3.7")
(AC Powered models):
110 H x 37 W x 93 mm D (4.3 x 1.46 x 3.7")
Operating Temperature: 0 to 60°C (32 to 140°F)
Storage Temperature: -20 to 70°C (-4 to 158°F)
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Rated 1 out of 5 by from 10% failure out of the box. LONG lead times. My machine is a tester for AC motorized units. Originally bought 10 pieces for voltage isolation. Six week lead time. One unit bad out of box (replaced after 5 week wait). I needed 10 more to add current measurements. Again, one of ten bad out of box. That's 2 bad out of 21. Bought for price but not worth it.
Date published: 2016-07-19
Rated 5 out of 5 by from Pretty reliable We had eighteen of these installed on a system upgrade in 2010. We had one fail now in 2019, so I feel that these are pretty reliable.
Date published: 2019-02-22
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According the the manual, the DRF sensors can be set, using DIP switches, to different input ranges. Can the DRF-VDC-24VDC-65V-0/10 bet set for a 650 Vdc input&gt;

Asked by: Tester77
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