CROWCON TRP-1638-CD Flame Block Module SM6095 ISS 4 (4.1)

CROWCON TRP-1638-CD Internal Drawing Ref: SM6095 ISS 4 / Revision 4.1 Flameproof and Intrinsically Safe Sensor Interface Flame Block Assembly for Crowcon Detection Instruments Ltd. This module contains the flame arrestor sinter barrier and the terminal contact interface for flammable and toxic gas detection sensors. It is designed and engineered for marine engine room atmospheres, offshore platform deck monitoring and hazardous industrial zone gas sampling systems.

The flame block acts as an explosion-proof barrier (EEx d). It stops any electrical spark or thermal ignition that might occur within the detector’s internal circuitry from spreading to the surrounding explosive hydrocarbon or gas-laden atmospheres. TRP-1638-CD is constructed with high-grade marine alloy housing and a micro-porous sintered stainless steel diffusion element, providing structural integrity in harsh ambient pressures, vibrations and corrosive salt-spray situations.

Model Details

• Primary Part Number (MPN): TRP-1638-CD
• OEM Assembly Part Number: S011375/AA
• PCB / Sub-Assembly Drawing: SM6095 ISS 4 (Revision 4.1)
• Model Series Designation: TRP/DET Flame Block / TPP/DTV Flame Block Module
• Manufacturer: Crowcon Detection Instruments Ltd. (UK)

Key Features

1. ATEX Flameproof Protection: Certified to II 2G EEx d IIC and I M2 EEx d I for deployment in Zone 1, Zone 2, and underground mining environments
2. High-Permeability Sintered Barrier: Precision micro-porous stainless steel sintered element allows rapid gas diffusion to sensor beads while quenching internal thermal energy.
3. Gold-Plated Terminal Interface: Low-resistance multi-pin interconnects prevent signal degradation caused by oxidation in high-humidity marine atmospheres.
4. Direct Drop-in Replacement: Factory-calibrated geometry ensures immediate seating into host instruments without mechanical modifications.

Cross-Reference Part Numbers

• Crowcon S011375/AA
• Crowcon S011375/USA
• Crowcon TRP-1638-CD ISS 4
• Crowcon SM6095 ISS 4 / Revision 4.1

Chief Engineer’s Installation Checklist

• Power Isolation First: Prior to removing the host instrument housing (Triple Plus+ or Detective+), power off the unit completely and ensure you are working in a non-hazardous deck area.
• Inspect Sinter Pore Integrity: Before fitting the SM6095 ISS 4 flame block, examine the sintered stainless steel face under 10x magnification. Ensure there is zero salt crusting, paint overspray, or hydrocarbon grease blinding the micro-pores.
• Check Terminal Pin Alignment: Ensure the 4-pin header block slides smoothly into the mainboard socket. Never force the module; misaligned pins cause high contact resistance, leading to false sensor zero-drift or sensor fault alarms on channel 1 (pellistor channel).
• O-Ring Seal Seating: Verify that the Viton ambient sealing ring around the flame block body is seated evenly in its groove. Damaged or pinched seals destroy the IP65/67 ingress protection, allowing water ingress into the sensor chamber during washdowns.

Applications

• Enclosed Space Entry Monitoring: Ballast tanks, cargo holds, pump rooms, and double bottoms aboard oil/chemical tankers and bulk carriers.
• Marine Engine Room Safety: Continuous monitoring of flammables and toxic gases around fuel oil purifiers and marine diesel generators.
• Offshore Rig Perimeter Defense: Deployable area gas monitoring using Crowcon Detective+ transportable stands on drilling decks.
• Industrial Chemical Plants: Portable gas protection during maintenance turnarounds in Zone 1 hazardous classified areas.

Frequently Asked Questions

What is the primary function of the Crowcon TRP-1638-CD flame block?

The Crowcon TRP-1638-CD is a flameproof (EEx d) sintered interface block. It protects gas sensors in Crowcon portable gas detectors by allowing gas to diffuse into the sensing element while physically preventing internal sparks from igniting explosive external gases.

Is the TRP-1638-CD compatible with the Crowcon Triple Plus+ gas detector?

Yes, the TRP-1638-CD (drawing SM6095 ISS 4) is an exact OEM replacement flame block designed specifically for the Crowcon Triple Plus+, Triple Plus+ IR, and Detective+ area monitors.

What ATEX rating does the SM6095 ISS 4 flame block hold?

The module is certified under ATEX certificate Sira 02ATEX1281U with protection codes II 2G EEx d IIC and I M2 EEx d I, rated for ambient temperatures between -40°C and +65°C.

Can I clean the sintered flame block if it becomes contaminated with oil or dirt?

If the sintered mesh is lightly contaminated with loose dirt, it can be cleaned using an ultrasonic bath with isopropyl alcohol (IPA) and thoroughly dried with clean, oil-free compressed air. However, if the sinter is blinded by silicone, heavy oils, or physical damage, the entire TRP-1638-CD module must be replaced to ensure safety compliance.

Do I need to recalibrate my gas detector after fitting a new flame block?

Yes. Changing the flame block alters the gas diffusion dynamics slightly. You should always perform a zero calibration and span gas check with known target gas concentrations after replacing internal sensor hardware.