Copyright 2022 Baker Hughes Company.
14 | PTC Temperature Calibrators–English
4.3.4 Surface Insert
The surface insert is used for calibrating surface temperature sensors. The surface insert is
hollow in construction. When installed, the top portion of the surface insert protrudes above the
dry block.
Figure
7: Surface Insert
The additional holes in the border, see Figure
7 item
2, are for external reference sensors. This
allows the exact temperature of the surface insert to be measured.
The two threaded boreholes in the border are for the accompanying exchange tool.
4.3.4.1 Installation
1. The surface insert is inserted into the dry block using the exchange tool, see Figure
7 item
3.
2. Centre the surface insert so that there is an even air gap between the surface insert and the
dry block.
4.3.4.2 External Reference Sensor (Optional Accessory)
Align the surface insert so that the hole for the external reference sensor is located at 12 o’clock.
4.3.4.3 Removal and Cleaning
1. Allow the calibrator cool before the surface insert is removed.
2. Pull the surface insert out of the dry block with the help of the exchange tool, see Figure
item
3.
3. Clean the surface insert and the dry block to prevent inserts from getting stuck in the dry
block.
4.3.4.4 Application Tips
When using an external reference sensor, insert the sensor into the borehole so that its
measuring element is situated under the middle of the calibration surface.
1 Surface insert.
2 External sensor bore holes:
1 × 3.0
mm (0.118″)
1 × 3.1
mm (0.122″)
1 × 4.5
mm (0.177″)
3 Insert exchange tool.
3
2
1
