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Pressure Temperature Transmitter STT850 SmartLine Digital Accuracy up to +/- 0.10 Deg C for RTD 4-20 mA dc
Introduction
Part of the SmartLine® family of products, the SmartLine STT850 is a high-performance temperature transmitter offering high accuracy and stability over a wide range of process and ambient temperatures. The SmartLine family is also fully tested and compliant with Experion ® PKS providing the highest level of compatibility assurance and integration capabilities. SmartLine easily meets the most demanding needs for temperature measurement applications.
Best in Class Features:
Industry leading performance
oDigital Accuracy up to +/- 0.10 Deg C for RTD
o Stability up to +/- 0.01% of URL per year for ten years
o 125 mSec update time for single input models
o 250 mSec update time for dual input models
Reliable measurement
o Built in Galvanic Isolation
o Differential/Averaging/Redundant/Split Range measurements
o Dual Compartment Housing
o Sensor Break detection
o Comprehensive on-board diagnostic capabilities
o Full compliance to SIL 2/3 requirements.
o Available with 15 year warranty
o Supports Namur 107 Extended Diagnostics
o Supports Namur 89 Wire break
o Direct entry of Callendar-Van Dusen coefficients R0, α, δ and β for calibrated RTD sensors (not
available on DE units)
Lower Cost of Ownership
o Universal input
o Dual sensor option
o Multiple local display capabilities
o Modular construction
o External zero, span, & configuration capability
o Polarity insensitive loop wiring
o Digital Output Option (only available with HART)
Communications/Output Options:
o 4-20 mA dc
o Honeywell Digitally Enhanced (DE)
o HART ® (version 7.0)
o FOUNDATION™ Fieldbus compliant to ITK 6.1.2 All transmitters are available with the above listed
communications protocols.
Instructions:
Make selections from all Tables Key through XIII using column below the proper arrow. Asterisk indicates availability. Letter (a) refer to restrictions highlighted in the restrictions table. Tables delimited w ith dashes.
Performance under Rated Conditions – All Models
| Parameter | Description |
| Input Span Adjustment Range | No limits to adjustments within the maximum range except minimum span limit of 1 engineering unit |
| Analog Output Digital Communications: | Two-wire, 4 to 20 mA (HART & DE Transmitters only) |
| Output Failure Modes (HART/DE only) | Honeywell Standard: NAMUR NE 43 Compliance: |
| Output Accuracy (HART/DE only) | ±0.005 % span |
| Supply Voltage Effect | 0.005 % span per volt. |
| Transmitter Turn on Time (includes power up & test algorithms) | HART or DE: 2.5 sec. Foundation Fieldbus: Host dependant |
| Analog Input | Stability: 0.01% of URL per Year for 10 years |
| Response Time | DE/HART Analog Output FOUNDATION Fieldbus |
| Update time | 125 mSec for single input units |
| Damping Time Constant | HART: Adjustable from 0 to 102 seconds in 0.1 increments. Default: 0.50 seconds |
| Ambient Temperature Effect | Digital Accuracy |
| Cold Junction Accuracy | ±0.25 °C |
| Total Reference Accuracy | Digital Mode |
| Sensor Burnout | Burnout detection is user selectable. Upscale or down scale with critical status message. For RTD or ohm type inputs; broken wire/wires will be indicated |
| Digital Output | Contact Rating |
| Vibration Effect | Per IEC60770-1 field or pipeline, high vibration level (10-2000Hz: 0.21 displacement/3g max acceleration) |
| Electromagnetic Compatibility | IEC 61326-3-1 |
| Isolation | 2000 Vdc (1400Vrms) Galvanic isolation between inputs and output. |
| Stray Rejection | Common Mode |
| EMC Compliance | EN 61326-1 and EN 61326-3-1 (SIL) |
| Lightning Protection Option | Leakage Current: 10 uA max @ 42.4 VDC 85 °C |