Safety Manual for Honeywell Searchpoint Optima Plus Gas Detector

Important Information

The Searchpoint Optima Plus requires a proof test interval of 1 year to maintain its safety parameters. Users may extend this interval according to IEC 61508 if proper calculation methods are followed. Note that the HART Communications and RS485 link must not be used for safety purposes.

Safety Parameters

• SFF: > 90%
• PFDavg: 2.6x10^-4
• PFH: 5.8x10^-8

Inspection and Maintenance

Regular inspection and cleaning are required. Always inhibit the 4-20 mA output signal before starting maintenance to prevent false alarms. If using a multimeter to monitor the output, power off the unit first to avoid latched warnings.

Cleaning Procedures

• Standard Weather Protection: Remove retaining nuts, inspect for debris, clean or replace the dust barrier, and clean optics with mild detergent and a soft cloth.
• Flow Housing: Disconnect pipework, remove retaining nuts, slide off the housing, and clean optics. Ensure O-rings are clean and in good condition before reassembly.

Proof Test Procedures

The manual provides specific instructions for performing proof tests using three different methods:

• SHC1 Handheld Interrogator: Includes inspection, re-zeroing, bump testing, and 4-20 mA loop verification.
• HART Communications: Includes device setup, inhibition, inspection, re-zeroing, bump testing, and mA loop testing.
• XNX Universal Transmitter: Includes specific inspection steps and integration with the XNX system.

Bump Test (Gas Challenge)

Functionally check the unit using an appropriate test gas. Ensure the unit has been powered up for at least 1 hour before testing. Apply test gas, verify the response, and ensure the reading returns to zero after removing the gas source.