ST132: Thermocouple/milliVolt Input Head-mount Transmitter

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.

Input

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

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)

Environmental

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

Physical

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