Emerson rosemount 68Q temperature sensor

Rosemount Series 68Q Sanitary RTD Temperature Sensors measure from –50 to 200 °C (–58 to 392 °F). These sensors are available in Tri Clamp endcap designs in immersion lengths from 1.0 to 9.5-in. Table 7 shows the interchangeability of the Rosemount Series 68Q Sensor.

Accuracy

Table 7: Rosemount Series 68Q Interchangeability (IEC 751 Class B)

±0.55 °C (±0.99 °F) at –50 °C (–58 °F)

±0.30 °C (±0.54 °F) at 0 °C (32 °F)

±0.80 °C (±1.44 °F) at 100 °C (212 °F)

±1.30 °C (±2.34 °F) at 200 °C (392 °F)

Construction

Rosemount Series 68Q Sensors conform to 3A® Sanitary Standards and feature product contact surfaces designed for CIP cleaning. The response times of Series 68Q Sensors meet the Grade A Pasteurized Milk Ordinance (PMO) specification for thermometric response of an indicating thermometer on a pipeline.

Rosemount Series 68Q Sensors are offered in a Tri Clamp sanitary endcap configuration. The sensor capsule is welded into the 316

SST sanitary endcap/stem assembly. The product contact of this assembly is polished to a finish that exceeds number 4 minimum

finish as required by the 3A Sanitary Council Standard #74-02.

Platinum element and lead wire configurations

Single-element temperature sensors have four lead wires and may be used in 2-, 3-, and 4-wire signal conditioning systems. Dual element sensors have six lead wires and may be used in 2- and 3-wire signal conditioning systems.

Specifications

Performance specifications

Temperature range

–50 to 200 °C (–58 to 392 °F)

Maximum hysteresis

±0.09 percent of operating temperature range

Stability

Tri Clamp O.D. tube size 1-in. and greater

±0.04 percent maximum ice-point resistance shift following 1,000 hours at maximum specified temperature 392 °F (200 °C)

Tri Clamp O.D. tube size ½- to ¾-in.

±0.08 percent maximum ice-point resistance shift following 1,000 hours at maximum specified temperature 392 °F (200 °C)

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