<6. Calibration>
6-4
IM 11R02A01-02E
5th Edition : Dec. 28, 2016-00
6.3 Calibration of the Computing Station
This chapter explains an ordinary calibration of the computing station. The calibration is
conducted as follows according to the type of the output.
• WI output .............. Calibrate with WI value.
• WI calorie output .. Calibrate with WI value and confirm the calorific value.
• Calorie output ....... Calibrate with calorific value.
In case of existing the preheating, the bias adjustment is carried out firstly.
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Bias Adjustment
This adjustment is carried out only when the preheating circuit exists.
1) Suspend the supply of the sample gas, and introduce the air to the gas line.
2) Set the “SAFE EV” switch of the calorie detector to “RELEASE”.
3) Set the computing station to Input/Output status display. After the indication Y4 (BIAS
CHECK) becomes stable (20 to 30 minutes), adjust the (Y4) value of the P03(BIAS) will
become [0.0] by the data setting key.
Note) When you perform a fine adjustment on a potentiometer, select alternatively between (Y4) and (P03) and display
4) When the adjustment is completed, turn the switch “SAFE EV” of the calorie detector to
“SET”, and suspend the air supply to the gas line.
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Zero and Span Adjustment
1) Introduce the zero gas and ignite.
2) Set the computing station to Input/Output status display. Adjust, with the “P01 (ZERO)” of
the operator, to be the “Y2 (WI)” or “Y1 [MJ/Nm
3
]” (WI value or the calorific value of the
calibration gas).
3) Change from zero gas to span gas, when, if let the span gas start flowing before the zero
gas valve is not completely closed, the burner is not extinguished. Same in the case of the
other way. If burner is extinguished, ignite.
4) Set the indication of the computing station to Input/Output status display. After the indication
“Y2 (WI)” or “Y1 (cal)” becomes stable, adjust with the “P02 (SPAN)” of the operator to
become WI value or the calorific value of the calibration gas. (Display P02, adjust by the
data setting key). (Confirm the result of the adjustment after displaying it as WI or cal)
5) Repeat 2 or 3 times the above adjustments.
6) When complete the adjustment, suspend the supply of the calibration gas.
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Other Adjustment
The adjustment of P04 (A-CORR, RATE), P06 (G-CORR, RATE) and P05 (A-TIME), P07
(G-TIME) is usually unnecessary. (Reserve the record of the data in the initial stage).
But when replacing the thermocouple, the regular adjustment is required. For the adjustment in
detail, consult our service personnel.
6.4
Calibration of the Density Meter
Regarding GD400G Gas density meter, refer to an attached Instruction Manual IM 11T3B1-01E.
