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5606, 5607 Full Immersion PRT
General
2 Introduction
2.1 General
The Hart Platinum Resistance Thermometers (PRT) models 5606 and 5607, are de-
signed to be a precision instrument converting temperature to resistance. The PRTs are
used with a readout device to detect temperature changes or actual temperature.
2.2 Application
The 5606 and 5607 Full Immersion PRTs are designed to perform in extreme environ-
ments where both the transition junction and the lead wires are required to withstand
temperatures covering the entire operating range of the probe.
The 5606 Immersion PRT has been designed to be fully immersed in common heat
transfer fluids such as silicone oil, mineral oil, ethanol, and liquid nitrogen and can
measure temperature ranging from –200 °C to 160 °C.
The 5607 Immersion PRT is intended to be used in dry mediums only but can be fully
immersed in ovens, furnaces, or autoclaves over a temperature range of 0 °C to 450 °C
2.3 Calibration
In order for any instrument to be used as a standard it must be calibrated. These
instruments are sold uncalibrated unless calibration is requested at time of purchase.
They are satisfactory as secondary standards and may be calibrated by comparison to
primary standards.
2.4 Recalibration
The recalibration of the 5606/5607 Full Immersion PRT should be scheduled accord-
ing to the user's company Quality Assurance requirements. Normally, a PRT is reca-
librated annually. Unless the PRT is used only over a limited range, calibration over
the full range of the PRT is recommended. For information on calibration services for
the 5606/5607, contact an Authorized Service Center for an RMA number and current
pricing (see Section 1.3, Authorized Service Centers, on page 2)
Depending on the user's Quality Assurance requirements, the PRT drift should be
checked periodically at the Triple Point of Water (TPW) or 0 °C. Section 8.1, Trouble-
shooting, on page 11, provides information on drift with respect to mechanical shock
and oxidation. If the R
ances, a full recalibration should be scheduled.
4
cannot be restored after annealing to within calibration toler-
tpw
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