Yokogawa GD40 Gas Density Detector - Manual (Page 154)

<8. DENSITY / CALIBRATION PROCEDURE>
8-1
IM 11T3E1-01E
8. DENSITY /CALIBRATION
PROCEDURE
This chapter describes how to calibrate of Density meter.
If select Calorie meter, see Chapter 9.
If select Hydrogen purity meter, see Chapter 10.
Zero and span calibration can be carried out using standard gases (zero and span gases). Three
modes are available for calibration: automatic, semi-automatic (remote semi-automatic) and
manual. Even if automatic calibration is enabled in the parameter setting, you can interrupt the
system with either the semi-automatic or manual mode of calibration. The following explains the
basic procedure and operation used in calibration.
8.1 Basic Calibration Procedure
Semi-automatic calibration mode
Calibration parameter setting See the process in Figure 8.2
See the process in Figure 5.1 Selection of semi-automatic/manual calibration
See the process in Figure 8.4
See the process in Figure 8.3.
Manual calibration mode
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8.2 Preparation for Calibration
Prepare for calibration during the initial operation of the analyzer, by carrying out the following.
• At the operation level, set the parameters for semi-automatic and manual calibration. Also
set the valve-operation parameter for switching between gases to check the valve perform- operation parameter for switching between gases to check the valve perform- peration parameter for switching between gases to check the valve perform-
ance.
• At the setting level, set the calibration data (zero- and span-point values, status of output
during calibration etc.)
• At the service level, determine whether automatic and remote semi-automatic calibrations
are enabled or disabled in CODE 13 and 14. Set the calibration data (selection of calibration
item, calibration time, stabilization time, etc.) in CODE 15.
8.2.1 Setting Type of Calibration and Checking Valve
Operation
(1) Operations to Set the Semi-automatic and Manual Calibration
In the measurement mode, press the [MODE] key, (if password is selected, enter the password
(XXX) (See section “4.2 Setting Lists”), ) and select the desired type of calibration.
• To select semi-automatic calibration, show [SEM.CAL] and press the [YES] key.
• To select manual calibration, show [MAN.CAL] and press the [YES] key.
For details on this process, see Figure 5.1.