Yokogawa AC8 Calibration Units - Manual (Page 10)

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IM 11M06D03-01E-A
IV. INSTALLATION, MANUAL CALIBRATION (MC1)
4.1 LOCATION
The following guidelines should be used when selecting a location for the calibration unit:
1) Easily accessible for maintenance and inspections.
2) Locating the MC1 close to the ZR22 probe minimizes the amount of tubing required for plumbing.
Conversely, mounting the MC1 close to the ZR402G eliminates the need for two technicians to accomplish
the calibration.
3) Ambient temperature should not exceed 55˚C (131˚F).
4) Humidity is moderate and no corrosive gases are present
5) Minimal vibration
6) Clean, dry instrument air is available
4.2 MOUNTING THE MC1
The MC1 unit is designed for wall mounting, and can be secured using four (4) standoff and four bolts. Sufficient
room should be made available for connecting the calibration and reference gas tubing.
The unit must be mounted as level as possible to ensure the accuracy of the flow rates
4.3 PIPING
Plumbing is required from the instrument air line and zero gas cylinders to the calibration unit. Standard 1/4” Stainless
Steel tubing is recommended. Separate tubing for the instrument air and zero gas are connected to the 1/4” FNPT
fittings on the LEFT side of the calibration unit. The input/output fittings are all 1/4”FNPT fittings, and are available in
brass or stainless steel. The probe connections (calibration and reference) are located on the RIGHT. See figure 4.1
Never use pure nitrogen for calibration.
Compressed gas cylinders must have the same CGA connection as the dual stage regulator. Refer to the
Appendix A (Spare Parts section) of this manual for the Dual Stage Regulator (M1132ZX) and the Zero
Pressure Switch (M1133AR).
4.3.1 PIPING TO THE ZR22G OXYGEN PROBE
4.3.2 Connection to the Calibration Gas Inlet
Connect the tubing from the Zero (cal) gas output, shown in Figure 3.1, to the CAL IN side of the ZR22 probe. If
the process is a positive pressure application, ensure that a check valve (Yokogawa Part Number M1234VV-A) is
installed between the CAL IN port and the 1/4” tubing. The check valve may already be installed on the detector
prior to shipping.
NOTE
NOTE
NOTE