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DRF-FR Freqency Input Signal Conditioner


DRF-FR Freqency Input Signal Conditioner | DRF-FR

DRF-FR Freqency Input Signal Conditioner

See All Models Below

  • NPN, PNP, NAMUR, Voltage Pulse, Voltage AC (up to 200 Vac)
  • Frequency Signals from 10 Hz up to 50 KHz
  • Accuracy 0.2%
  • Excitation Voltage 15 Vdc (20 mA) or 9V2 for NAMUR
  • Galvanic Isolation between Input, Output and Power
  • Part of a Comprehensive Family of Signal Conditioners
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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-FR signal conditioner accepts a frequency input and provides 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-FR 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 . Module response time is 250 ms or less.

Adjustable Input Ranges
The front door of the housing provides easy access span and offset potentiometers which may be used field adjust the input and output signal range. The ranges shown in the Range Table below are supported.

Range CodeRange
20HZ0 to 20 Hz
40HZ0 to 40 Hz
60HZ0 to 60 Hz
100HZ0 to 100 Hz
200HZ0 to 200 Hz
300HZ0 to 300 Hz
500HZ0 to 500 Hz
1KHZ0 to 1 KHz
Range CodeRange
2KHZ0 to 2 KHz
3KHZ0 to 3 KHz
5KHZ0 to 5 KHz
10KHZ0 to 10 KHz
20KHZ0 to 20 KHz
30KHZ0 to 30 KHz
50KHZ0 to 50 KHz

The input, output and power circuits are isolated by 3500 volts of galvanic isolation. The isolation protects against potentially damaging voltages from passing through the signal conditioners into connected systems. The isolation also provides improved measurement accuracy by minimizing the effects of ground loops and electrical noise.

Each DRF series signal conditioner is available with current and voltage output (only one may be used at a time). Available output types include 4 to 20 mA or 0 to 10 Vdc. Although pre-configured before shipping from the factory, the output may be changed through an internal jumper change. Standard outputs are linear and proportional to the signal input.


Signal Type: NPN, PNP, NAMUR, Voltage Pulse, AC up to 200 Vac (2 ranges < 24 Vac and < 200 Vac)
Accuracy: <0.2% full scale
Linearity: <0.1% full scale
Thermal Drift: 250 ppm/°C typical (max <200ppm/°C)

Response Time
0 to 100 Hz:
<300 mS (90% of signal)
0 to 500 Hz: <250 mS (90% of signal)
0 to 5 KHz: <200 mS (90% of signal)
0 to 50 KHz: <150 mS (90% of signal)

Voltage Input:
(<24 Vac Range): 100 KΩ
Voltage Input: (<200 Vac Range): 1 M
PNP and NPN Input: 10 KΩ
NAMUR Input: 1 KΩ

Over Range Protection
Voltage Input (<24 Vac Range):
75 V
Voltage Input (<200V ac Range): 300 V
PNP and NPN Input: 35 V
NAMUR Input: Always powered by 9V2

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)
(Specify Model Number)
Part Number/Desc.
Below are examples of popular models. Use the Part Number Builder to order a specific model.
Consult Sales  
Frequency signal conditioner with 115Vac power, 0-5KHz input range and 4-20mA output
Consult Sales  
Frequency signal conditioner with 115Vac power, 0-1000Hz input range and 0-10Vdc output
Availability: 1 week
Frequency signal conditioner with 115Vac power, 0-100Hz input range and 0-10Vdc output
All prices on this site are shown in Thai Baht.
Note: All models come with a complete user's manual.

Option Descriptions:

(1) Power select from:
24VDC for 24 Vdc
115VAC for 115 Vac

(2) Input Range select from:
20HZ for 0 to 20 Hz
40HZ for 0 to 40 Hz
60HZ for 0 to 60 Hz
100HZ for 0 to 100 Hz
200HZ for 0 to 200 Hz
300HZ for 0 to 300 Hz
500HZ for 0 to 500 Hz
1KHZ for 0 to 1000 Hz
1KHZ for 0 to 1 KHz
2KHZ for 0 to 2 KHz
3KHZ for 0 to 3 KHz
5KHZ for 0 to 5 KHz
10KHZ for 0 to 10 KHz
20KHZ for 0 to 20 KHz
30KHZ for 0 to 30 KHz
50KHZ for 0 to 50 KHz

(3) Output select from:
4/20 for 4 to 20ma
0/10 for 0 to 10Vdc
Note: All combinations may not be valid, check spec sheet for valid part numbers.
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