Digi-Stem® DST500-FM Series RTD Thermometer with Factory Mutual Approval

Digi-Stem Meters & Probes are sold separately and paired together to create a complete custom system. This listing is for the meter only.

Please review our Order Guide and choose the meter power source, mounting, and other specifications needed to build a meter.

Description

Digi-Stem® meters and probes are sold separately for a completely customizable system. The DST500-FM is an RTD system with Factory Mutual approval for measuring temperatures in hazardous areas, where the three basic requirements for an explosion to take place are found: a flammable substance, an oxidizer, and an ignition source. This model is intrinsically safe, limiting the energy available to be below the energy required to cause combustion of a combustible material or gas, even in a fault condition.  FM approval is for the following:

IS/CL I, II, Ill/ DIV 1 / GP ABCDEFG / T4A Ta= 70°C; Type 4X
CL I, II, Ill/ DIV 2 / GP ABCDEFG /T4A Ta= 70°C; Type 4X

This model must be powered with an FM approved C Cell sized lithium metal battery (p/n: DSA3060).

This RTD model has a wide temperature range and high accuracy design for applications that require accurate and reliable temperature monitoring.

Our Digi-Stems® are known for their reliability and rugged cases.  The housing is stainless steel with a NEMA-4X rating.  Dimensions are 5.3 inches wide x 4.3 inches high x 2.7 inches deep (13.5cm wide x 10.9 high x 6.9 cm deep).  The large 1 inch high LCD display is readable from 30 feet away.

The DST500-FM is available with fixed and remote probes, built to order to customer specification and sold as a system.  The DST500-FM Series features programmable “R0” for “matching” the sensor to meter and polycarbonate H-frame.

Our Digi-Stem Meter Selection Guide can help with choosing the correct meter for your application. Click to see a side-by-side comparison of the different models.

DST500-FM Lithium Metal Battery Installation and Return Shipment Instructions

Specifications

Probe Type / Sensor

Pt100, Class A 4-wire RTD Sensor in 316 Stainless Steel or Inconel 600, Thin Film or Wire Wound. R0 = 100Ω, Alpha = .00385 Ω/Ω/°C

H Frame Material

Polycarbonate

Temperature Range

-328° to 1472°F (-200° to 800°C)

Scale

°F and °C, switchable

Meter Accuracy

± 0.1°F/C, over 1-year period (@ Tamb = 23°C ± 5°C)

Meter & Probe Accuracy

°C Temp < 300°C = ± 0.15 + 0.2% of reading, Temp > 300°C = ± 0.25 + 0.5% of reading;
°F Temp < 572°F = ± 0.27 + 0.2% (reading -32), Temp > 572°F = ± 0.45 + 0.5% (reading -32)

Display

1.0” 4-digit LCD display with icons for °F, °C, low battery and error warnings.

Display Resolution

0.1°F/C; 1°F above 999.9°F

Sample/Display Rate

2 Seconds, adjustable in .25 Second intervals to .25 to 10 seconds with software.

FM Approved for Hazardous Locations

IS/CL I, II, III / DIV 1 / GP ABCDEFG
T4A Ta = 70°C, Type 4X
CL I, II, III / DIV 2 / GP ABCDEFG
T4A Ta = 70°C, Type 4X

Humidity

10 to 100% RH, non-condensing

Ambient Operating Temperature

-40° to 158°F (-40° to 70°C)

Ambient Temperature Coefficient (From 23°C ± 5°C)

Maximum of 0.003°/°C over Ambient Operating Temperature Range

Vibration

Vibration - MIL STD 202G

Battery Power

1-FM Approved “C” Sized Lithium Metal Battery, P/N: DSA3060

Battery Life

4 years nominal at 2 second update interval

Housing

Stainless Steel, NEMA 4X rated

Dimensions

5.3 in. W x 4.3 in. H x 2.7 in. D (13.5 cm W x 10.9 H x 6.9 cm D)

Weight

2 lbs (1 kg)

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