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Series-ARM
Analog Current/Voltage Rescaling Module
- Rescales analog control signals: The ACI ARM accepts voltage or current input signals and converts them to another voltage or current output signal for better controller compatibility.
- Ideal for signal adaptation: Use it for resistance-to-current, resistance-to-voltage, voltage-to-current, current-to-voltage, and other non-compatible signal conversions.
- Flexible field adjustment: Multi-turn potentiometers allow fine adjustment of gain, offset, attenuation, and reverse-acting output for precise setup.
- Improves sensor range matching: Helps shrink or expand sensor ranges, increase analog input resolution, and adapt signals to match BAS controller requirements.
- Supports reverse signal operation: Can invert an output signal, making it useful when a controller or actuator requires reverse-acting control.
- Built-in sensor power: Includes a regulated 20 VDC power output for powering compatible sensors during signal conversion applications.
- Wide input compatibility: Supports 0-35 VDC, 0-44 mA, and resistance inputs up to 500,000 Ω using voltage divider applications.
- Panel-ready interface module: Compact snap-track design with captive screw terminals supports clean installation in control panels and equipment enclosures.
Product Overview
- Accuracy Detail Output Accuracy: +/- 1%
- Applications Building and Maintenance, Electronic Equipment, Environmental Monitoring
- Approvals RoHS2, WEEE
- Electrical Connection Screw Terminal
- Height 1 in
- Impedance Output Note Output Current Load Impedance: 750Ω @ 20 mA; Output Voltage Load Impedance: 3300Ω @ 20 VDC +/- 10% / 400Ω @ 10 VDC +/- 10%
- Input Current 0 to 44 mA
- Input Type Note Input Resistance Signal Range: 0 to 500,000Ω
- Input Voltage Note 0-35 VDC @ 1,000,000Ω
- Length 3.69 in
- Materials PVC
- Operating Humidity 10 to 95% RH, non-condensing
- Operating Temperature, Max 120 °F
- Operating Temperature, Min 35 °F
- Output Configurations Rescalable
- Output Note Field Adjustable Ranges: Multi-turn potentiometers; Output Voltage Signal Range: 0.25 VDC minimum to 20 VDC maximum; Output Current Signal Range: 44 mA maximum, Signal Gain 1 to 25 times (nominal) depending on input value; Output Signal Attenuation: 0 to 100%; Output Signal Offset: 0.25 to 20 VDC; Output Signal Inversion (RA): 20 to 0.25 VDC (nominal)
- Series ID Series-ARM
- Storage Temperature, Max 150 °F
- Storage Temperature, Min -20 °F
- Supply Current 200 mA
- Supply Voltage 24 Vac/Vdc
- Tightening Torque 0.5 Nm (Minimum); 0.6 Nm (Maximum)
- Weight 0.2 lb
- Width 2.17 in
- Wire Gauge 22 to 12 AWG
Supported Applications
The ACI Series ARM Analog Current/Voltage Rescaling Module accepts an analog voltage or current input signal and rescales it to another voltage or current output signal. The module is designed for applications requiring adjustable gain, offset, and signal inversion capabilities. It supports resistance inputs via voltage divider applications and provides a regulated 20 VDC power supply output suitable for powering sensors.
Operating Conditions & Performance
The Series ARM operates within an ambient temperature range of 35 to 120°F (1.7 to 48.9°C) and supports storage temperatures from -20 to 150°F (-28.9 to 65.5°C). Humidity ratings are specified as 10 to 95% non-condensing. The device accepts input voltage signals of 0-35 VDC @ 1,000,000Ω and input current signals from 0 to 44 mA @ 250Ω. It also supports an input resistance signal range of 0 to 500,000Ω.
Output performance includes a voltage signal range of 0.25 VDC minimum to 20 VDC maximum and a current output up to 44 mA with a nominal signal gain adjustable from 1 to 25 times depending on the input value. Output accuracy is rated at +/- 1%. The module features field-adjustable ranges via multi-turn potentiometers, allowing for fine adjustments of output ranges.
Electrical Specifications
- Power Supply: 24 VAC or 24 VDC (+/- 10%), 50/60 Hz; maximum supply current is 200 mA.
- Regulated Power Output: 20 VDC +/- 10%, 30 mA maximum.
- Output Signal Offset: Adjustable from 0.25 to 20 VDC (nominal).
- Signal Attenuation: Capable of attenuating an input signal up to 100%.
- Load Impedance: Output current load is 750Ω @ 20 mA; output voltage load is 3300Ω @ 20 VDC +/- 10% or 400Ω @ 10 VDC +/- 10%.
Configuration Options
The Series ARM offers configurable options for installation and environmental protection. The standard unit features a Polyvinyl Chloride (PVC) snap track with a UL94 V-0 flammability rating. Connections are made via 45° captive screw terminal blocks compatible with wire sizes from 12 AWG (3.31 mm²) to 22 AWG (0.33 mm²), requiring a torque of 0.5 Nm minimum and 0.6 Nm maximum.
Available Accessories
- DIN Rail Adapter Kit: Item number 142626, model A/DRC 2.7 X 2.18.
- Metal Enclosure: 20 Gauge Metal Enclosure (Item # 102472, Model ENC1) designed to hold Interfaces products.
- Transient Voltage Suppressor: Bi-directional, 56VAC/DC, 1500W (Item # 142583, Model A/D0008).
Calibration Options
The module is field calibratable. Factory calibration is available upon request for an additional charge to speed up installation time.
Key Product Differences
The standard ordering model is ARM (Item # 102028). A special calibration option, C/ARM (Item # 137061), allows users to specify custom input and output configurations. The product dimensions are listed as (L) 3.69" (W) 2.17" (H) 1.00" (93.73 x 55.12 x 25.54 mm), with a weight of 0.200 lbs. (0.0907 Kg). The device carries RoHS2 and WEEE agency approvals.
