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Technical Specifications

RTD Options Several RTD curves are embedded in the microprocessor including: DIN 100 platinum, SAMA 100 platinum, DIN 1000 platinum and Special curves. A 22 point offset function is available for non standard curve programming and precision trimming of temperature value.

Wireless Instrumentation

RTD Temperature Field Unit - 23702 RTD Temperature Field Unit

Linearization Models WI-RT-I WI-RT-S

RTD linearization to ± .05° C Custom linearization with 22-point curve

Accuracy of Electronics

± 0.1 % of full-scale reading RTD: ± 0.002 % of reading per °C for ambient temperature effect

Long-Term Stability

Stability deviation per year is less than 0.025 %

Operating Ambient Environment

-40° F to +185° F (-40° C to +85° C) electronics -4° F to +158° F (-20° C to +70° C) display with full visibility -40° F to +185° F (-40° C to +85° C) display with reduced visibility Humidity Limits: 0 to 95 %, non condensing

Local Configuration

Integrated LCD display with membrane switch buttons Display rotates through tag number, temperature and RF status

RTD Temperature Field Unit Description

Configure sampling and RF parameters locally using membrane switch buttons

The RTD Temperature Field Unit comes complete with a signal conditioner and a RF transceiver operating in the 902 MHz to 928 MHz ISM license-free band. It is battery powered with up to twenty (20) year battery life. Sensors may be integrated (-I), or split (-S) packages. The split architecture package includes one or two discrete contact closure inputs for simple apparatus. The split sensor option enables easy field replacement of probes. One sensor input is available with the split RTD sensor package. Data from the sensor is transmitted to the Base Radio for centralized monitoring and data acquisition. You may specify updates between once per second and once per minute based on your monitoring and control needs Power Characteristics

Self-contained power ‘C’ Size 3.6 V lithium battery
Wireless Instrumentation WI-RT Product Description 08/30/07 Up to twenty (20) year battery life (depends on sample rate and RF update rate), field replaceable

RF Characteristics

902 MHz – 928 MHz Frequency Hopping Spread Spectrum (FHSS), FCC certified ISM license-free band Up to 3000’ range from Base Radio with clear line of sight; 500’ to 1000’ typical range with obstructions. Two miles possible with high gain antennae The RF module in each Field Unit is individually tested and calibrated over the full temperature range to ensure reliable wireless operation .

The RTD is included in the integrated version of the RTD Temperature Field Unit, Model WI-RT-I. The standard probe is a 4 wire DIN curve 100 platinum RTD. Probes are available with either spring loaded or direct insertion fitting with probe lengths of 2.5,” 4.5”, 6” or 9”. Custom RTD lengths can be provided on a special order basis, however non standard probes should use the split architecture. With the split architecture, the RTD is not included with sensor unit and it can be easily replaced in the field. Self-Diagnostics

Low battery alarm – indicates the need to replace the battery (approximately one month warning) Contains extensive self-checking software and hardware that continuously monitors the operation. Any sensor or device parameter out of spec is identified and reported

Physical Characteristic

Standard process connection ½” MNPT (other options available) Thermowells available on request