Digital RTD Meter features FM approval.

Press Release Summary:

Designed for hazardous locations where accurate temperature monitoring is critical, DST500-FM features fixed stem probe, which is available in 304 SS or 316 SS with straight or 90° back, left, or right angle connection. Thermometer has NEMA 4X-rated housing and 1 in. 4-digit LCD that is readable from 30 ft. With temperature range of -328 to 1472°F, 4-wire RTD provides total system accuracy of ±0.3°F for temperatures <300°F and ±0.25% for temperatures >300°F over 1-year period.

Original Press Release:

Palmer Wahl Instrumentation Group Announces New FM Approved RTD Meter

Asheville, NC — Palmer Wahl Instrumentation Group is proud to announce the Factory Mutual (FM) Approval of its Wahl DST500-FM Temperature Indicators with fixed probes in the US and Canada. The Wahl DST500-FM Digital RTD thermometer is a wide range, high accuracy thermometer designed for hazardous locations where accurate and reliable temperature monitoring is critical.  Fixed stem probes in straight or 90° Back, Left, or Right angle connection from either 304 or 316 stainless steel are available, with user selectable °F or °C display.   The 4 wire RTD has a total system accuracy of ±0.3°F (±0.2°C) for temperatures less than 300°F (148.8°C) and ± 0.25% of reading for temperatures greater than 300°F (148.8°C) over a 1-year period. Temperature range is -328° to 1472°F (-200° to 800°C).  The 1”, four digit LCD display is readable from 30 feet, with resolution of 0.1°F/°C (1°F above 999.9°F).  The rugged stainless steel and polycarbonate housing is rated NEMA 4X.  The Wahl DST500-FM is factory configurable to your specification.   System is tamper resistant, with all adjustments requiring the optional DSTCAL software kit for programming and calibration. Use DSTCAL to adjust sample rate from .25 to 10 seconds in .25 second intervals, an exclusive feature of Wahl Digi-Stems.  DST500-FM Models are Made in the USA and include a two-year warranty; NIST traceability is available.  Standard DST500 models are also available.

Wahl DST500-FM Approvals

In the USA: IS/I, II, III/1/ABCDEFG/T4A Ta = 70°C – 13327;

NI/I, II, III/2/ABCEDFG; T4A Ta = 70°C; Type 4X

In Canada: IS/I, II, III/1/ABCDEFG / T4A Ta = 70°C – 13327;

NI/I/2/ABCD; DIP/II, III/2/EFG; T4A Ta = 70°C; Type 4X

For additional information please contact us at or call 1-800-421-2853, fax 828-658-0728. Write to Palmer Wahl, 234 Old Weaverville Road, Asheville, NC 28804.

About Palmer Wahl

Palmer Instruments, started as America's first thermometer company in Cincinnati, OH in 1836.  Since that time, Palmer has steadily evolved through product development geared exclusively towards industrial process measurement, test and calibration. Wahl Instruments, founded in Culver City, CA in 1953, manufactured precision temperature instruments for industry, and developed the first portable digital platinum-RTD contact thermometer system. Since then, Wahl has introduced many technical innovations in precision portable temperature instruments.

Together Palmer Wahl, with over 178 years of continuous product innovation, offers the finest selection of Industrial Instrumentation products in the world, and is uniquely qualified to provide application/technical support, installation, calibration services and product selection from an extensive line of the finest instrumentation products. For more information, visit

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