5.30
6. Solder the blue wire to the upper pin and the black wire to the lower pin. Care must be
taken not to overheat the pins. See Figure 5.1.
7. Carefully slide photocells into zero assembly and lock in mid-position with the M4 screw.
8. Replace magnet assembly. See Section 5.3.2, paragraphs 7 to 10.
5.3.2.4 Replacement of Temperature Sensor Assembly
Refer to Figures 5.2 and 6.2.
1. Remove magnet assembly by following steps 1 to 6 of Section 5.3.2.
2. Remove wires connected to the assembly - one grey, two brown and four black.
3. Unscrew Thermistor (5) (3/8"A/F spanner)(10mm A/F on earlier instruments) and M4 pan
head screw (41).
4. Unsolder measuring cell grey/red and red/black wires from back of assembly.
5. Reassembly is the reverse of the removal process. Ensure that the wires are connected
correctly. See Figure 5.2.
6. Replace magnet assembly. See Section 5.3.2, paragraphs 7 to 10.
5.3.2.5 Replacement of the Thermistor.
Refer to Figures 5.2 and 6.2.
1. Remove magnet assembly by following steps 1 through to 6 of paragraph 5.3.2.
2. Unsolder two black wires on thermistor (5) and remove by unscrewing sensor (10mm A/F
spanner). See Figure 5.2.
3. Reassembly is a reversal of removal process.
4. Replace magnet assembly. See Section 5.3.2, paragraphs 7 to 10.
5.3.2.6 Replacement of Temperature Switch (1132 Unit only).
1. Remove cover from heater junction box on left hand side of the transducer by removing
4 x M6 socket head screws and disconnect the heater supply.
2. Remove the front cover and front insulation as described in steps 1 and 2 of Section
5.3.2.
3. Unscrew the 20mm nut on the inside of the case securing the heater assembly.
4. Withdraw the heater assembly.
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