25
Calibration Procedure
1) Connect a mV source to thermocouple input.
2) Connect a DVM to TP1.
3) Set mV source to give a reading of 3.00 volts at TP1.
(This should correspond to 300°C input = 12.2mV).
4) Connect DVM TP2.
5) Adjust VR1 to give reading of -2.81 volts at TP2.
6) Connect DVM to TP3.
7) Adjust VR2 to give reading of +4.14 volts at TP2.
8) Adjust VR3 so that it is in a position approximately half way between the positions
where LEDs 2 and 5 and LEDs 1 and 5 are illuminated.
PCB calibration is now complete and a check of binary output can be made using Table 1.
Air flow adjustment is dealt with in 'setting Up Procedure'.
TABLE 1
TEMP TEMP Mv FLOW VALVE ENERGISED/WIRE COLOUR
°C °F litre/min 1 2 3 4 5
Brown Red Orange Yellow Green
25 77 1.0 29.0 X X X
50 122 2.0 29.0 X X X X
75 167 3.1 28.5 X X X
100 212 4.1 28.0 X X X
125 257 5.1 27.5 X X
150 302 6.1 21.0 X X X X
175 347 7.1 20.5 X X X
200 392 8.1 20.0 X X X
225 437 9.1 19.5 X X
250 482 10.2 19.5 X X X
280 536 11.4 19.0 X X
310 590 12.6 18.5 X X
340 644 13.9 18.0 X
370 698 15.1 12.5 X X X X
430 806 17.7 12.0 X X X
490 914 20.2 11.5 X X X
550 1022 22.8 11.0 X X
610 1130 25.3 11.0 X X X
Flow rate litre/min 0.5 1.0 1.5 9.5 18.0
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