Yokogawa IAC-24 User Manual

Model IAC-24-22-E-A Installation Guide

THE IAC-24

The IAC-24 auto-calibration unit mounts directly to the Yokogawa ZR22G oxygen detector. The connections are made via 1/4” reference air and calibration gas ports located on the detector and the 1/4” fittings on the IAC-24. The IAC-24 uses solenoid manifolds that automate the calibration process; the solenoid are powered by the ZR402G analyzer. The analyzer activates the solenoid allowing the calibration and reference gas to flow to the detector; since the manifold has a fixed orifice no flow adjustment is needed.

General Specifications:

Input pressure: 7 psig +/- 2 psig Output Flow:

Ref: 0.8 SLPM Cal: 0.6 SLPM

Input Flow: Min: 3.5 SLPM

Dimensions: 4.5” x 3.5” x 1.9” (w 115mm x h 89mm x t 49mm)

Electrical requirements: 24 V DC

Connections: 2 x 1/4” swage type pneumatics fitting

3 pin quick connect fitting

Ambient

Temp: 194°F (90°C)

1.1 LOCATION

The following guidelines should be used when selecting a location for the calibration unit:

1) Easily accessible for maintenance and inspections

2) Ambient temperature does not exceed 194°F (90°C)

3) Humidity is moderate and no corrosive gases are present

4) Instrument air is available

1.2 Calibration/Reference Gas Zero:

Never use pure nitrogen. Typically, 1% instrument grade O2 balanced in nitrogen is used for zero gas; however, an O2 mixture between 0.4% and 8% is acceptable. A compressed gas cylinder containing certified gas mixtures fitted with a dual stage regulator should be used. Span: A clean, dry air source, such as instrument air, is recommended. Install an in-line filter before the calibration unit to remove any moisture or dirt. A regulator must be attached to the instrument air source to provide the appropriate working pressure for the calibration unit. Reference: Reference air is from the same source as the span gas. The reference air flows to the backside of the zirconia cell and is used at all times. The calibration unit is plumbed to provide a continuous flow rate of reference air, as well as calibration gas flow during calibration.

oration of America

a Co

Y 2 Dart Road Newnan, Georgia U.S.A. 30265

el: 1-800-888-6400 Fax: 1-770-251-2088

IM 11M1 2D01-91-E-A

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1st Edition March, 2005

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ch. 2005

1.3 PIPING

Parts list:

2 M1132RR ss male connection fittings 1 IAC-24 –22-E-A calibration unit 1 Instruction sheet

1.4 Mounting the IAC-24

1) Wrap the threads of the M1132RR with Teflon tape and thread into the ZR22G calibration and reference ports.

2) Push the male connectors into the IAC-24 device (IAC24/ZR22G assembly should resemble Fig.1) Tighten the fittings on the IAC-24 to seal the IAC-24 onto the male connections.

3) Connect the 1/4” tube to the IAC-24. Instrument air must be 21% air 02.

4) Set the inlet gas pressure to the IAC-24 to 7 PSIG +/-2 PSIG.

Fig. 1

Important Note:

To prevent leakage all threaded fittings should have teflon tape (or suitable alternate).

1.5 Wiring CAUTION: The IAC-24 requires 24VDC. It will fail if 120VAC is used for power. Consult the factory for

directions to convert from an AC to a DC autocalibration system.

The IAC-24 requires a special electrical connector. This is purchased separately as an integral part of the cable. For a new installation of the ZR402G and ZR22G system the WZ-H-6H-[ ] heater cable should be used with the analyzer/detector combination. This cable has the wire and connections for both the detector heater and the 24VDC autocalibration accessory. This cable may be used with both the ZR402G single point analyzer and the AV550

G multipoint analyzer.

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Subject to change without notice.

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