Product Overview

The Honeywell 2108B0272 Searchpoint Optima Plus Calibration Cap is a dedicated calibration accessory for the Searchpoint Optima Plus infrared point gas detector. It is used to establish a controlled gas application arrangement during detector calibration, helping technicians introduce calibration gas to the detector’s measurement chamber under the conditions required for an accurate calibration procedure.

Unlike the Gassing Cover, which is intended for applying gas during functional checks in the field, the Calibration Cap is specifically intended for calibration. The distinction matters during maintenance because a functional gas test and an instrument calibration are not the same operation. Each requires the appropriate accessory and installation arrangement.

The 2108B0272 is particularly useful in industrial facilities where fixed hydrocarbon or ethylene gas detection equipment must undergo scheduled calibration. Typical installations include oil and gas processing facilities, chemical plants, offshore platforms, and industrial compressor stations. In these environments, gas detectors are installed at locations where a release could create a fire or explosion hazard. Periodic calibration helps maintain the accuracy of the detector’s measurement response.

During calibration, the cap is fitted to the Searchpoint Optima Plus detector to establish the gas inlet and outlet arrangement. Calibration gas is introduced through the designated inlet, passes through the measurement area, and exits through the outlet. This controlled gas application allows the technician to carry out the calibration procedure without relying on uncontrolled ambient gas conditions.

An important installation requirement is that the detector’s weather protection must be removed before fitting the Calibration Cap, except for the dust barrier. Leaving other protective accessories in place can interfere with the intended calibration arrangement.

The 2108B0272 is a temporary maintenance accessory rather than a permanent part of the detector installation. Once calibration is complete, it must be removed so that ambient gas can reach the detector’s measurement chamber normally. Leaving the cap installed would obstruct the normal gas exposure path and compromise the detector’s ability to monitor its surroundings.

For maintenance teams responsible for Searchpoint Optima Plus installations, the 2108B0272 provides a dedicated accessory for carrying out controlled calibration work while keeping calibration procedures separate from routine functional testing.

Technical Specifications

Product Features

• Dedicated Calibration Accessory: Developed for calibration procedures involving the Searchpoint Optima Plus infrared gas detector.
• Controlled Gas Application: Provides designated inlet and outlet connections for introducing calibration gas through the detector measurement area.
• Calibration-Specific Function: Separates detector calibration from routine functional gas testing performed with the Gassing Cover.
• Measurement Chamber Access: Allows calibration gas to reach the detector’s optical measurement area under the prescribed calibration arrangement.
• Compatible with Dust Barrier: Can be installed while retaining the detector’s dust barrier, with other weather protection accessories removed.
• Maintenance-Oriented Design: Supports scheduled calibration work in fixed gas detection installations.
• Temporary Installation: Intended to be fitted during calibration and removed immediately after the procedure.
• Searchpoint Optima Plus Compatibility: Matches the calibration requirements of the corresponding infrared point gas detector.

Working Principle

The 2108B0272 operates by establishing a controlled gas application path around the measurement chamber of the Searchpoint Optima Plus detector. Its purpose is not to measure gas concentration independently, but to allow the detector to be exposed to a known calibration gas during the calibration process.

The calibration arrangement can be understood through the following sequence:

Calibration Gas Supply → 2108B0272 Inlet → Searchpoint Optima Plus Measurement Chamber → Calibration Cap Outlet

Preparing the Detector

Before calibration begins, the technician must prepare the detector according to the Searchpoint Optima Plus operating procedure.

All weather protection accessories must be removed except the dust barrier. This step is necessary because the Calibration Cap must have the correct access to the detector’s measurement chamber.

The detector’s optical surfaces and surrounding installation should also be checked for contamination or other conditions that could affect the calibration procedure.

Introducing Calibration Gas

Once the Calibration Cap is correctly fitted, calibration gas is introduced through its inlet connection.

The gas passes through the measurement area of the Searchpoint Optima Plus detector, exposing the infrared sensing system to the known gas concentration.

The outlet provides a path for the gas to leave the calibration arrangement. This helps establish the intended gas application conditions during the procedure.

Detector Response and Calibration

The Searchpoint Optima Plus uses infrared absorption technology to detect target gases. When calibration gas enters the measurement chamber, the detector responds to the infrared absorption characteristics of the gas.

The technician follows the detector’s calibration procedure and checks the measured response against the known calibration gas concentration.

The calibration process allows the detector’s measurement response to be adjusted according to the prescribed procedure. The Calibration Cap provides the gas application arrangement, while the detector’s internal sensing and signal-processing circuits perform the actual measurement.

Removing the Calibration Cap

After the calibration procedure has been completed, the 2108B0272 must be removed.

This is an essential part of the process rather than an optional maintenance step. The cap is intended for temporary use, and leaving it fitted can prevent ambient gas from reaching the measurement chamber.

Once the accessory has been removed, the detector’s normal weather protection arrangement can be restored according to the installation requirements.

Calibration Versus Functional Testing

The 2108B0272 should not be confused with the Honeywell 2108D0258 Gassing Cover.

The Calibration Cap is used for accurate calibration and requires the weather protection arrangement to be changed before installation. The Gassing Cover is used to apply gas during field functional checks and fits over the standard weather protection.

Choosing the correct accessory helps prevent confusion between verifying detector operation and performing an actual calibration.

Role in the Searchpoint Optima Plus Gas Detection System

The Honeywell 2108B0272 serves as a maintenance accessory within the Searchpoint Optima Plus fixed infrared gas detection system. It supports calibration activities without becoming part of the detector’s permanent gas monitoring configuration.

A typical maintenance arrangement follows this sequence:

Searchpoint Optima Plus Gas Detector → Remove Weather Protection Except Dust Barrier → Install 2108B0272 → Introduce Calibration Gas → Verify Detector Response → Remove Calibration Cap → Restore Normal Detector Configuration

In an industrial gas detection installation, the Searchpoint Optima Plus normally operates continuously with its designated weather protection installed. During scheduled maintenance, the detector is temporarily prepared for calibration.

The 2108B0272 is fitted only for this maintenance operation. After calibration, removing the cap restores the detector’s access to ambient gas, allowing it to return to its normal monitoring function.

This separation between permanent detector accessories and temporary calibration equipment is important when maintaining gas detection systems in hazardous industrial environments.

Industrial Applications

Installation and Maintenance

1. Verify Detector Compatibility: Confirm that the accessory is Honeywell 2108B0272 and that the installed gas detector belongs to the Searchpoint Optima Plus family.
2. Review the Calibration Procedure: Check the applicable detector operating instructions and confirm the required calibration gas, concentration, and maintenance procedure.
3. Prepare the Work Area: Follow the facility’s gas testing and permit requirements before starting maintenance in a hazardous area.
4. Inspect the Calibration Cap: Examine the inlet, outlet, housing, and sealing surfaces for damage, contamination, or deterioration.
5. Prepare the Detector: Remove all weather protection accessories except the dust barrier, as required by the Searchpoint Optima Plus calibration procedure.
6. Check the Measurement Area: Ensure that the detector’s measurement chamber is accessible and that the optical area is not obstructed by dirt or other contaminants.
7. Fit the Calibration Cap: Install the 2108B0272 in the specified position and ensure that the gas connections are correctly aligned.
8. Connect the Calibration Gas Supply: Connect the gas delivery line to the designated inlet and arrange the outlet according to the prescribed calibration procedure.
9. Introduce Calibration Gas: Apply the specified calibration gas under the required flow conditions and allow the detector response to stabilize.
10. Complete the Calibration: Follow the Searchpoint Optima Plus calibration procedure and verify the detector’s response against the known gas concentration.
11. Remove the Calibration Cap: Disconnect the gas supply and remove the 2108B0272 immediately after the calibration procedure. Do not leave the cap fitted during normal detector operation.
12. Restore the Detector Configuration: Reinstall the required weather protection accessories, inspect the detector, and confirm that normal gas monitoring operation has resumed.

Compatible System Components

Recommended Related Models

Key Advantages

• Provides a dedicated gas application arrangement for Searchpoint Optima Plus calibration.
• Includes designated gas inlet and outlet connections.
• Supports calibration using known gas concentrations.
• Separates calibration procedures from routine functional gas testing.
• Can be installed while retaining the detector’s dust barrier.
• Supports scheduled maintenance of fixed infrared gas detection systems.
• Removable after calibration to restore normal ambient gas access.

Technical FAQs

What is the difference between the Honeywell 2108B0272 and 2108D0258?

The 2108B0272 is a Calibration Cap used for accurate calibration of the Searchpoint Optima Plus detector. The 2108D0258 is a Gassing Cover intended for field functional checking. The two accessories have different installation arrangements: the Calibration Cap requires removal of all weather protection except the dust barrier, while the Gassing Cover fits over the standard weather protection.

Does the dust barrier need to be removed before installing the 2108B0272?

No. The Searchpoint Optima Plus calibration procedure specifies that all weather protection must be removed except the dust barrier. The dust barrier can therefore remain installed while the Calibration Cap is fitted.

Can the Calibration Cap remain installed after calibration?

No. The 2108B0272 is intended for temporary use during calibration. It must be removed after the procedure because leaving it fitted can prevent ambient gas from reaching the detector’s measurement chamber, interfering with normal gas detection.

Does the 2108B0272 perform the actual gas measurement or calibration adjustment?

No. The accessory only establishes the gas application arrangement. The Searchpoint Optima Plus detector performs the infrared gas measurement, while the technician carries out the calibration and verifies the detector response using the prescribed procedure and known calibration gas concentration.