User's Manual for CM6G - Yokogawa

9. Calibration 9-1For calibration, zero and span gases are necessary. Use the gas with the specifications asnear to each measuring range for both lower limit and upper limit as possible.9.1 Supply of the Calibration Gas9.1.1 For Town Gas UseSEE ALSORefer to Figure 6.2 and 6.3.a) Close V-6 and open V-7. In this time, the burner is extinguished. But if the pump is attached,close V-6 and open V-7, after turn off the power supply of the pump.b) Adjust the secondary pressure of the pressure reducing valve for calibration gas cylinder, tobecome approx. 200 kPa.c) Open V-9 or V-10 and introduce the calibration gas.d) Adjust the indication of the flowmeter (3-3), by the pressure reducing valve (4-1), to becomeabout 10 l/min. In case of only indication check, its adjustment of approximately 2 to 3 l/min ispermissible.e) Push the “START” switch of the calorie detector to ignite.f) Set the computing station to Input/Output display screen (refer to Figure 6.15). If the indication of“X2 (A-PRESS)” and “X3 (G-PRESS)” is not ”500”, adjust each with the pressure reducing valve(3-6) and V-16.g) In the case of the density meter being attached, confirm and readjust (if necessary) the indicationof the flowmeter (5-3).h) When the calibration is completed, close V-9, V-10, V-7, and open V-6. In the case of the pumpbeing attached, supply the power supply of the pump as the next step.i) Push the “START” switch of the calorie detector to ignite.j) Confirm and readjust (if necessary) the gas differential pressure and the flow rate to the densitymeter.k) Do not forget to close the root valve of the calibration gas cylinder.IM 11R02A01-02E