Table 5-10 Alarm Adjustment Procedure - Honeywell 7866 Operation And Maintenance Manual

Triple range digital h2 and co2 analyzer/indicator and gas sampling panel

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Table Of Contents

Table of Contents

Adjustment of the Range 3 Alarm Limits

A four-digit password may be required to adjust the Alarm limits. If the password is unknown, consult

your designated plant technician for the password. If you have forgotten the password, see Appendix B for

the Security Bypass Procedure.

Alarm Limits may be adjusted while the 7866 Digital Controller is operating. Care should be taken to

minimize the effects of entering out-of-range values.

Step

Press

SET UP

FUNCTION

The 7866 should be supplemented with additional safety systems where possible and appropriate. Pressure loss

detectors and redundant gas loss detectors are recommended in critical applications. The user always assumes the

responsibility of the correctness of the safety system design. It is always recommended that the installer, designer,

and user consult with their insurance company, local authorities, and industry guidelines on such matters.

The alarm will activate when the measured percentage of hydrogen falls below the setpoint. A deadband, also called

"hysteresis", will prevent clearing of the alarm until the measured Hydrogen is above the setpoint by 0.5 percent.

Failure to comply with these instructions could result in death or serious injury.

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7866 Triple Range Digital H