Oldham Simtronics OPGD-888260-4 Function Check Filter Alarm Level – Methane Calibration

What is the Oldham Simtronics OPGD-888260-4?

The Oldham Simtronics OPGD-888260-4 is: Function Check Filter Alarm Level – Methane Calibration. The SafEye Quasar 900 is an open path infrared detector for combustible gases. It works as an infrared transmitter and a receiver separated by 4 to 200 metres, measuring how much radiation the gas along that path absorbs and comparing it with the background absorption of the atmosphere. A single path can replace up to 20 point detectors. The unit is built for harsh sites: stainless steel construction, heated optics, IP66 and IP68 protection to NEMA 250 6P, and it keeps working through up to 95 percent obscuration caused by dust, fog, rain, snow or vibration.

About the Quasar 900 Open Path Gas Detectors line

This part is an accessory for the Quasar 900 Open Path Gas Detectors line. The specification below describes the detectors it is used with, not the accessory itself.

• Detection method: open path infrared absorption across a transmitter and receiver pair
• Gases detected: combustible gases
• Detection range up to 200 metres, from 4 metres minimum separation
• Tolerates up to 95 percent obscuration from dust, fog, rain, snow or vibration
• Outputs: 4-20 mA, HART, RS485 Modbus RTU, plus built-in relays
• Power supply 18 to 32 V DC
• Heated optics and stainless steel construction, IP66 and IP68, NEMA 250 6P
• SIL 2 certified by TUV Rheinland
• Certifications: CE, ATEX, IECEx, FM

What should you check before ordering?

The commercial case for an open path unit is the count it displaces: one Quasar 900 path covers ground that would otherwise need up to 20 point detectors, each with its own installation, cabling and test schedule. Response is under 3 seconds, with T90 under 10 seconds, and the published MTBF is a minimum of 100,000 hours, so a single path is a monitored point rather than a device that quietly stops answering. The housing is tested to MIL-STD-810C for humidity, salt fog, vibration and mechanical shock. Range is fixed by the model ordered rather than configured on site, and the four models in the 2026 price book step through 7-20 m, 15-40 m, 35-100 m and 80-200 m.

How do the part numbers differ?

Model number carries the range: Quasar 901 covers 7 to 20 m, 902 covers 15 to 40 m, 903 covers 35 to 100 m and 904 covers 80 to 200 m, each offered with ATEX or FM approval and with M25 or 3/4 inch NPT entries.

Where is it used?

Typical service: Perimeter monitoring of combustible gas across wide open areas; Replacing a line of point detectors along a process boundary; Sites with dust, fog, rain or snow that attenuate an optical path; Onshore and offshore hydrocarbon installations.

How do I order or get a quote?

PE Energy supplies the Oldham Simtronics OPGD-888260-4 on a quote basis: send the part number with your application details and we return pricing and lead time. Fixed gas and flame detection is quoted rather than listed because most references ship configured for target gas, range, approval scope and cable entry, and those choices are fixed at the part number. This part belongs to the same product line as the SafEye Quasar 900 open path combustible gas detector already in our catalogue.