DH Instruments ADCS-601, Operation And Maintenance Manual

Page: 163 / 174

7. MAINTENANCE OF TRACEABILITY AND RECALIBRATION
Page 151 © 2005 DH Instruments, Inc.
Figure 64. ADCS Tools PG7601 AMH-38 Mass Set Calibration Form
7.3.4 PG7601, CALIBRATION OF PISTON-CYLINDER MODULE
TEMPERATURE SENSOR
7.3.4.1 OVERVIEW
The PG7601 Platform uses a platinum resistance thermometer (PRT) embedded
in the piston-cylinder mounting post to measure the temperature of piston-
cylinder module.
The PRT is a 10052 4-pole type following DIN Norm 43760. The current
supplied to the PRT is 1 mA and the slope of resistance relative to temperature
over the valid temperature range of 0 to 40
°
C is 0.3896
Ω
/
°
C. The uncertainty
specification is ± 0.1
°
C (
±
0.02
Ω
) with a resolution of 0.01
°
C.
The ohmic measurement system in the PG7601 is self-calibrated using on-board
100 and 110
Ω
reference resistors.
The normal calibration procedure of the PRT is to determine it’s offset relative at
ambient temperature relative to a reference. This can be done without removing
the RPT from the mounting post if a reference is available that can be inserted in
the mounting post pressure bore (see Section 7.3.4.2). The PRT slope, over the
limited range of use of 0 to 40
°
C, can be considered a physical constant.
Once the offset is determined, it is entered into the system using ADCS Tools
(see Section 7.3.4.3).
It is possible to remove the PRT from the mounting post if necessary. To remove
the PRT from the PG7601 mounting post, follow the instructions provided in
Section 6.3.7.