Yokogawa AC8 Calibration Units - Manual (Page 12)

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IM 11M06D03-01E-A
V. SETUP PROCEDURES, MC1
5.1 INITIAL FLOW RATE SETUP
Locate the reference air flow meters, and adjust the flow adjustment knobs as outlined below:
Reference Air: 0.8 LPM
Calibration Gas: 0.6 LPM
The maximum working pressure of the MC1 and AC1 unit is 35 psi. Excessive pressure can damage the
Zirconia cell of the ZR22G Oxygen Probe.
5.2 MC1 FLOW RATE SETUP
Performing a calibration
For accurate calibrations, the manual calibration system must provide a fixed flow of zero and span gas during
calibration. There are two flow meters and one hand valve for the MC1. The hand valve is used only during
calibration to flow either span gas or zero gas to the probe, using the CAL GAS flow meter to indicate the flow rate.
The REF AIR flow meter is used to flow the reference air for the ZR22 probe, and remains flowing at all times, with a
flow rate of 0.8 LPM. The ZR402 display will prompt the user to perform the following steps, when programmed for
One Touch (TCH) calibration:
1. Position the valve knob to SPAN GAS ON. This will start the flow of Span Gas to the probe.
2. Adjust the CAL GAS flow meter to show 0.6 LPM as the flow rate. If necessary, adjust the reference flow meter
to show 0.8 LPM.
3. To stop the flow of Span gas, position the valve knob to the OFF position.
4. To start the flow of Zero gas to the probe, position the valve knob to ZERO GAS ON.
5. Adjust the CAL GAS flow meter to show 0.6 LPM as a flow rate. If necessary, adjust the reference flow meter to
show 0.8 LPM.
6. To stop the flow of Zero gas, position the valve to the OFF position.
If reference air is used during calibration, the reference air must be left ON after calibration.
5.3 CHECKING FOR LEAKS
1. Position the valve to SPAN
2. Apply a leak detection spray on all compression fittings and bends of the cal line tubing for the probe, the MC1
gas inlets/outlets, and the probe inlets for CAL and REF gas.
3. Inspect the full length of the CAL and REF lines for leaks.
4. Repair leaks as necessary, and within applicable guidelines
5. After repairing the leaking areas, repeat the inspection instructions above for the affected areas.
6. Upon completion, return the valve to the OFF position, and set the Reference and Cal gas flow rates to 0.8 LPM
and 0.6 LPM respectively
CAUTION
WARNING