The ST132 is a low-cost two-wire transmitter that converts a millivolt or thermocouple sensor input to a proportional 4-20mA control signal. Power is received from the output loop current. The transmitter performs signal linearization, cold-junction compensation, and lead-break detection functions. Setup and calibration are fast and easy with a convenient USB connection to your PC and Acromag’s Windows configuration software. Advanced signal processing capabilities, variable range input, and convenient USB programming make this instrument a very versatile temperature measurement device. These transmitters can withstand harsh industrial environments and operate reliably across a wide temperature range with very low drift. They feature RFI, EMI, ESD, EFT, and surge protection plus low radiated emissions.

Performance Specifications

Important: To prevent damage or errors from grounded PCs and surges, Acromag strongly recommends use of the USB-ISOLATOR when configuring and ST130 transmitter.

USB Interface

USB Connector: USB Mini-B type socket, 5-pin USB Data Rate: 12Mbps. USB v1.1 and 2.0 compatible USB Transient Protection: Transient voltage suppression on power and data lines USB Cable Length: 5.0 meters maximum Driver: Not required. Uses built-in Human Interface Device (HID) USB drivers of the Windows operating system.


Default Configuration/Calibration: Input: TC J, -40°F to 176°F (-40°C to 80°C), upscale break, high filter. Output: 4 to 20mA Input Ranges and Accuracy: Input                          Range                                   Accuracy TC J          -210 to 760°C (-346 to 1400°F)           ±0.5°C TC K         -200 to 1372°C (-328 to 2502°F)         ±0.5°C TC T          -260 to 400°C (-436 to 752°F)             ±0.5°C TC R            -50 to 1768°C (-58 to 3214°F)           ±1.0°C TC S            -50 to 1768°C (-58 to 3214°F)           ±1.0°C TC E         -200 to 1000°C (-328 to 1832°F)         ±0.5°C TC B           260 to 1820°C (500 to 3308°F)          ±1.0°C TC N         -230 to 1300°C (-382 to 2372°F)        ±1.0°C mV            -100 to 100mV                                          ±0.1mV Error includes the effects of repeatability, terminal point conformity, and linearization at 25°C operating ambient temperature. Thermocouple Reference (Cold Junction Compensation): ±0.1°C typical, ±0.3°C maximum at 25°C Ambient Temperature Effect: Better than ±75ppm/°C (±0.0075%/°C) Zero Scaling Adjust: 0 to 95% of range, typical Full Scale Adjust: 5 to 100% of full scale range, typical Lead Break (Sensor Burnout) Detection: Configurable for either upscale or downscale Thermocouple Input Bias Current: ±250nA typical (TC break) Input Over-Voltage Protection: Bipolar Transient Voltage Suppressers (TVS), 5.6V clamp level typical Input Filter Bandwidth: -3dB at 55Hz, typical, normal mode filter Resolution: milliVolt input: 0.005% (1 part in 20,000) Thermocouple input: 0.1°C Input Filter: Normal mode filtering, plus selectable digital filtering settings (none, low, medium, high) optimized and fixed per input range within the A/D converter. Noise Rejection (Normal Mode): 75dB @ 60Hz, typical with 100 ohm input unbalance


Output Range: 4 to 20mA DC Output Compliance: Rload = (Vsupply - 7V) / 0.02A Rload = 0 to 850 ohms @ 24V DC Output Response Time (for step input change): Time to reach 98% of final output value ranges from 8ms (with no filtering) to 800ms (with high filtering)


Operating temperature: -40 to 80°C (-40° to 176°F) Storage temperature: -40 to 85°C (-40 to 185°F) Relative Humidity: 5 to 95% non-condensing Power Requirement: 7-32V DC SELV (Safety Extra Low Voltage), 25mA maximum Isolation: Not isolated Shock and Vibration Immunity: Vibration: 5g, per IEC 60068-2-64 Shock: 50g, per IEC 60068-2-27 Electromagnetic Compatibility (EMC) Compliance: Radiated Emissions: BS EN 61000-6-4, CISPR 16 RFI: BS EN 61000-6-2, IEC 61000-4-3 Conducted RFI: BS EN 61000-6-2, IEC 61000-4-6 ESD: BS EN 61000-6-2, IEC 61000-4-2 EFT: BS EN 61000-6-2, IEC 61000-4-4 Surge Immunity: BS EN 61000-6-2, IEC 61000-4-5 Approvals: CE compliant. UL/cUL listings. ATEX Certified Designed for Class I; Division 2; Groups ABCD; Zone 2 II 3 G Ex nA IIC T4 Gc -40°C < Ta < +80°C


General: General purpose enclosure with potted circuit designed for mounting in DIN Form B connection heads. Case Material: Self-extinguishing polycarbonate ABS plastic, UL94 V-0 rated base material. USB dust cap material is Santoprene, 251-70W232. I/O Connectors: Barrier strip type, captive screw terminals Wire range: AWG #14-28 solid or stranded Shipping Weight: 0.5 pounds (0.22 Kg) packed

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    ST132: Thermocouple/milliVolt Input Head-mount Transmitter

    • Universal thermocouple (8 types) or ±100mV input
    • 4-20mA output
    • Loop-powered, 7-32V DC
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    ST133: Isolated Transmitter; Thermocouple/mV Input

    • TC type J, K, T, R, S, E, B, and N or ±100mV input
    • 1500V isolation
    • 4 to 20mA DC output
    • USB-configured
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