Honeywell STT173 temperature transmitter

product details

Honeywell STT173 temperature transmitter

Product Overview

The Honeywell STT173 temperature transmitter is a member of the Honeywell STT3000 Smart STT170 series — a family of microprocessor-based programmable temperature transmitters engineered for cost-effective, reliable temperature monitoring across diverse industrial applications-5. The Honeywell STT173 features a compact DIN form B head mount design measuring 44 mm in diameter and 20.2 mm in height, making it compatible with even the smallest DIN B head housings-5-. The Honeywell STT173-BS variant includes a 316 stainless steel process connection for enhanced corrosion resistance-14.

Compared to direct-wired temperature sensor monitoring points, the Honeywell STT173 delivers increased accuracy, safety, and reliability while substantially reducing wiring costs-. The STT173 automatically linearizes the temperature output signal within user-defined upper and lower range values and supports programmable high/low limit alarms activated upon sensor failure-.

The STT3000 STT173 is a 2-wire programmable temperature transmitter that can measure temperatures within all RTD ranges defined by the norms-3. The STT173 can also convert linear resistance variation to a standard analog current signal, making it suitable for valve position feedback and Ohmic level sensors-3.

Supported Sensor Types & Input Compatibility

The Honeywell STT173 temperature transmitter supports RTD, TC, Ohm, and mV inputs, offering exceptional versatility for temperature measurement applications-2. The STT173 can be programmed to measure temperatures with Pt100, Ni100, or thermocouple sensors-3. Supported thermocouple types include E, J, K, L, N, R, S, T, B, U, W3, and W5-5. The STT173 also supports Pt1000 and millivolt inputs-5.

The RTD and resistance inputs on the STT173 feature cable compensation for 2-wire, 3-wire, and 4-wire connections, ensuring reliable and accurate readings even over extended cable runs-2.

Accuracy Specifications by Sensor Type

The Honeywell STT173 delivers high measurement accuracy across all supported sensor types-:

Sensor Type	Basic Accuracy	Rated Range
Pt100	0.2°C ±0.1%	-200 to +850°C
Ni100	0.2°C ±0.1%	-60 to +250°C
Type B	2°C ±0.1%	+400 to +1820°C
Type E	1°C ±0.1%	-100 to +1000°C
Type J	1°C ±0.1%	-100 to +1200°C
Type K	1°C ±0.1%	-180 to +1372°C
Type N	1°C ±0.1%	-180 to +1300°C
Type R	2°C ±0.1%	-50 to +1760°C
Type S	2°C ±0.1%	-50 to +1760°C
Type T	1°C ±0.1%	-200 to +400°C
Ohm Input	0.12 Ω ±0.1%	0 to 5000 Ω

For Pt100 and Ni100 inputs, the STT173 achieves ±0.1°C accuracy-5.

Electrical Specifications

Parameter	Specification
Output Signal	4-20 mA analog
Supply Voltage	8 to 35 VDC
Power Supply Effect	≤0.005% of span per VDC
Load Resistance	0 to 870 Ω (≤ (Vsupply – 8)/0.023 A)
Galvanic Isolation	1.5 kVAC
Response Time	Less than 1 second (programmable: 0.33 to 60 sec)
Update Time	440 ms
Power Consumption	≤ 23 mA (max)

The Honeywell STT173 temperature transmitter operates within a wide supply voltage range of 8 to 35 VDC, offering flexibility across different industrial power systems-5. Its 1.5 kVAC galvanic isolation rating provides robust protection against electrical interference-2. The isolation between circuits can withstand a test voltage of 500 VAC for one minute-3. Response time is user-programmable from 0.33 to 60 seconds, with a default of less than one second-5.

Environmental & Operating Conditions

Parameter	Specification
Ambient Temperature Range	-40°C to +85°C (-40°F to +185°F)
Relative Humidity	0 to 95% RH (non-condensing)
Vibration	Max 4g over 25 to 100 Hz
Ingress Protection (STT173-BS)	IP67 (dustproof and water jet resistant)
Storage Temperature	-40°C to +100°C

The STT173 is designed to withstand harsh industrial environments. The -BS variant enclosure meets IP67 ingress protection standards, making it suitable for outdoor or wet environments-14. For ambient temperatures at or above 60°C, heat-resistant cables with a rating at least 20 K above the ambient temperature must be used-3.

Sensor Error Response (NAMUR NE43 Compliance)

The Honeywell STT173 temperature transmitter complies with NAMUR NE43 standards for sensor failure signaling-:

Upscale alarm: 23 mA

Downscale alarm: 3.5 mA

Sensor error value is user-programmable

This feature ensures that control systems can immediately detect sensor failures and take appropriate action, enhancing overall process safety-2-19.

Configuration & Communication

The STT173 is configured using the Honeywell STT17C PC-based configuration tool — a USB communications interface with an intuitive graphical user interface that virtually eliminates the need for operator training-. Within a few seconds, the user can program the Honeywell STT173 to measure temperatures within all RTD ranges defined by the norms-2.

The STT17C configuration toolkit provides maintenance engineers and instrument technicians easy and quick access to all configuration parameters for the STT170 series transmitters-. The STT173 continuously checks vital stored data for safety purposes-2.

Mechanical Specifications

Parameter	Specification
Dimensions	44 mm diameter × 20.2 mm height
Weight (STT173-BS)	Approximately 0.7 kg
Mounting Type	DIN form B sensor head mount / DIN rail mount
Enclosure Material	316 stainless steel (process connection)
Electrical Connections	Polarity-insensitive, ISO 9001 compliant

The compact size of the Honeywell STT173 allows direct head mounting, compatible with even the smallest DIN B head housings–14. The polarity-insensitive electrical connections prevent damage due to incorrect wiring, enhancing user convenience and reducing potential downtime-14.

Safety Certifications & Approvals

The Honeywell STT173 temperature transmitter carries multiple international safety certifications-5:

ATEX — EN 50014, EN 50020, EN 50281 (KEMA 06 ATEX 0042 X)-

CSA — CSA certification for hazardous locations

FM — Factory Mutual approved

IECEx — International IECEx certification

CE — CE marked

EMC — EN 61326 compliant

RoHS — RoHS compliant

UL — UL listed

SIL 2/3 — Compliant with SIL 2/3 requirements-

For safe installation in hazardous areas, the STT173-BS module must only be installed by qualified personnel familiar with national and international laws and standards applicable to the area-3. The transmitter must be mounted in an enclosure providing at least IP20 ingress protection-3.

Key Applications

The Honeywell STT173 temperature transmitter is deployed across numerous industrial sectors-:

Chemical processing plants — Corrosion-resistant 316 stainless steel construction-

Petrochemical and oil refineries — Hazardous area certifications-

Power generation facilities — High reliability and accuracy-

Pharmaceutical manufacturing — Precise temperature control-

HVAC systems — Wide operating temperature range-14

OEM equipment integration — Cost-effective programmable solution-5

Valve position feedback — Linear resistance variation conversion-3

Installation Considerations

When installing the Honeywell STT173 in explosive atmospheres caused by air/dust mixtures, the transmitter may only be installed in a metal enclosure form B according to DIN 43729 providing ingress protection of at least IP6X in accordance with EN 60529-3. For enclosures made of aluminum installed in Zone 0, 1, 20, 21, or 22, the enclosure shall not contain by weight more than 6% in total of magnesium and titanium-3.