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AC Powered Frequency Input DIN Rail Signal Conditioner
TRODEKS Engineering | Thermocouples, Pressure Transducers, Flow Meters, PID Controllers
  • Eliminates Ground Loops
  • Field Configurable Input Ranges 2 Hz to 10,000 Hz
  • Field Configurable Output Ranges
  • 150 mV to 150V Input Amplitude
  • Provides an Isolated DC Output in Proportion to Input Frequency
  • Touch Calibration
  • Universal AC Power 85 to 265 Vac
 Manuals (contact with email : [email protected])


The DRI-FR is a DIN rail mount,frequency input signal conditioner with1800 Vdc isolation between input, outputand power. The field configurable input andoutput offers flexible, wide ranging capabilityfor variable frequency drives, magnetic pickups,turbine flow meters, and other pulse or frequencyoutput transducers.

The input of the DRI-FR can be configured for anyfrequency span from 2 to 10,000 Hz. The inputamplitude threshold sensitivity can be adjusted from150 mVp to 150 Vp to ensure accurate frequencymeasurement and minimize transient noise relatederrors. The maximum input amplitude is 150 Vrms.The output can be set for either 0 to 5V, 0 to 10V,0 to 1 mA, 0 to 20 mA or 4 to 20 mA.

The DRI-FR can be field configured for virtually anyfrequency input to DC signal output within the rangesspecified. There is also an 8 Vdc excitation sourcecommon to the input. This can be used as a signalsource for relay contacts or as an excitation source foropen collector type proximity sensors. The DRI-FR isAC powered and will accept any power between85 and 265 Vac.

The DRI-FR utilizes Touch Calibration to greatlysimplify configuration. The high and low input rangesare stored in nonvolatile memory and correspond tothe high and low output range which is selected viaDIP switches.

The DRI-FR utilizes three diagnostic LEDs. The green(RUN) LED indicates DC power and input signal status.Active line power is indicated by an illuminated LED. Ifthe input signal is 7% or more high, the LED will flashat 8 Hz. If the input signal is 7% or more low, the LEDwill flash at 4 Hz.

The yellow (IN) LED is lit when calibrating the input.The red (OUT) LED is lit when calibrating the output.

The DRI-FR field configurable, frequency input signalconditioner is useful in eliminating ground loops andinterfacing pulse output transducers, such as turbineflow meters and magnetic pickups, to data acquisitionand control systems.

Advanced digital technology, combined with ASICtechnology, provides a stable output at low frequenciesfor higher accuracy, and 3-way isolation whichcompletely eliminates ground loops from any source.

Any 2 Hz range from 0 to 10,000 Hz can be convertedto a full scale output signal (e.g. 0 to 2 Hz/4 to 20 mA or9998 to 10,000 Hz/4 to 20 mA).

The factory default configuration for the DRI-FR isas follows:

Input Range:
0 to 1000 Hz
Sensitivity (Noise Rejection Level or TriggerThreshold of the Input): 1 Vrms
Output Range: 4 to 20 mA


    Full Scale Range: 2 Hz to 10,000 Hz
    Amplitude Range: 150 mVp to 150 Vrms
    Impedance: >10 kΩ
    Overvoltage: 180 Vrms max
    Over-Range: 20 KHz max
    Common Mode (Input to Gnd): 1800V max
    Zero Turn-Up: 99% of full scale range (9998 Hz)
    Span Turn-Down: 99% of full scale range (2 Hz)

Voltage Output:
    Range: 0 to 5V, 0 to 10V (dip-switch selectable)
    Source Impedance: <100 Ω
    Drive: 10 mA max (1 kΩ min @ 10 V)
Current Output:
    Output: 0 to 1 mA, 0 to 20 mA, 4 to 20 mA (dip-switch selectable)
    Source Impedance: >100 kΩ
        0 to 1 mA: 7.5V max (7.5 kΩ max)
        0 to 20 mA: 12V max (600 Ω max)
        4 to 20 mA: 12V max (600 Ω max)
Accuracy (Including Linearity and Hysteresis): ±0.1% of selected range at 25°C
Temperature Stability: ±0.025%/°C maximum of selected range
Excitation Voltage: 8 Vdc, for open collector and contact closure inputs (5 mA short circuit current max)
Response Time (10 to 90%): 500 msec, or 100 times the period of the full scale frequency
Common Mode Rejection: DC: 100 dB; >60 Hz: 80 dB
Isolation: 1800 Vdc between input, output and power
ESD Susceptibility: Capable of meeting IEC 801-2 level 3 (8 KV)
LED Indication:
    LVL (Green): Lit when power is on; input <107% then 8 Hzflash; input >-7% then 4 Hz flash
    IN (Yellow): Input range programming status
    OUT (Red): Output range programming status
Humidity (Non-Condensing):
    Operating: 15 to 95% RH @ 45°C (113°F)
    Soak: 90% RH for 24 hours @ 65°C (149°F)
Temperature Range:
    Operating: 0 to 55°C (5 to 131°F)
    Storage: -25 to 70°C (-13 to 158°F)
Power: 100 to 240 Vac ±10%, 50 to 400 Hz; 2.5 W max
Wire Terminations: Screw terminals for 12 to 22 AWG
Weight: 227 g (0.50 lb)
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