Fluke 5623A 2 Introduction

2 Introduction

The PlatinumResistance Thermometers (PRT) model 5623A is designed to be

a secondary standardinterpolating instrument converting temperature to resis-

tance.The 5623A assembly design allows for exposure to very cold tempera-

ture (–200°C)and is an ideal reference for verification, monitoring or

calibrating control sensors in located in freezers or incubators. The 5623A may

also be used asa temperature standard for calibration of industrial sensors. The

PRTis used with a readout device to detect temperature changes or actual tem-

perature. The 5623A coversthe range from –200°C to 156°C. Standard length

is 6 inches. Customlengths are available on request.

The recalibration of the 5623APRT should be scheduled according to the

user’scompany Quality Assurance requirements. Normally, a PRT is

recalibratedannually. Unless the PRT is used only over a limited range, calibra-

tionover the full range of the PRT (–200°C to 156°C) is recommended. For in-

formation on recalibratingyour 5623A, contact an Authorized Hart Scientific

ServiceCenter for an RMA number and current pricing (see Section 1.3).

Depending on the user’sQuality Assurance requirements, the PRT drift should

be checkedperiodically at the Triple Point of Water (TPW). Section 7,Trouble-

shooting, provides information on drift with respect to mechanical shock and

oxidation.

5623A 5

2Introduction