I. Model Explanation (330191-40-75-10-05)

330191: 3300 XL 8mm ETR high-temperature probe (straight mount, 3/8-24 UNF)

40: Shell length = 4.0 inches (101.6mm)

75: Threadless length 7.5mm (bare section)

10: Total system length = 1.0 meter (probe + built-in cable)

05: ATEX/IECEx explosion-proof certification (Zone 0/1, Ex ia IIC T4/T6)

ETR = Extended Temperature Range: High-temperature type, with higher temperature resistance than the ordinary 8mm probe.

II. Core Parameters (Electrical / Mechanical / Temperature)

Electrical (50Ω, 8mm XL)

Sensitivity: 7.87 mV/μm (200 mV/mil)

Linear range: 0.25～2.3 mm (10～90 mil)

Frequency response: 0～10 kHz (±3dB)

Impedance: 50Ω (standard XL, not 75Ω/300Ω)

Target surface: 4140 steel (default)

Power supply: -17.5～-26V DC (12mA max) Mechanical

Thread: 3/8-24 UNF external thread (straight installation)

Shell: 303/304 stainless steel

End: PPS polyphenylene sulfide (temperature resistant)

Cable: ETR high-temperature PFA insulation (232℃)

Installation torque: ≤ 0.565 N·m (5 in-lb)

Temperature (ETR + explosion-proof, critical)

Operating temperature: -55℃ ～ +232℃ (T1)

Explosion-proof rating: Ex ia IIC T4/T6 (05 = ATEX/IECEx)

Storage temperature: -55℃ ～ +240℃

III. Standard Accessories (50Ω XL System)

Probe: 330191-40-75-10-05 (1m, ETR, explosion-proof)

Preamplifier: 330180-01-05 (1m calibration, explosion-proof)

Extension cable: 330130-010-05 (1m, ETR, explosion-proof)

Monitoring card: 3500/40, 3500/42, 3500/45 (compatible with 50Ω)

⚠️ Must be 50Ω matched; cannot be mixed with 75Ω (33010x) or 300Ω (33028x).

IV. Typical Applications (High Temperature + Explosion-proof + Straight Installation)

Petroleum / Chemical: Ex ia explosion-proof area (such as hydrogenation, reforming, ethylene plants)

Gas turbine: 200～230℃ high-temperature bearing box, exhaust section vibration / displacement

Steam turbine: High temperature + explosion-proof combined cycle, LNG unit

Compressor: Hazardous area Radial vibration, axial movement monitoring

High-speed pump / fan: ATEX Zone 0/1 environment, long-term high temperature (>180℃)

V. Difference from ordinary 8mm probe (330104) Table

Parameters: 

330191 (Explosion-proof ETR) 330104 (Standard Formal)

Impedance: 50Ω (XL) 75Ω (Old standard)

Maximum temperature: 232℃ (ETR) 177℃ (Standard)

Explosion-proof: ATEX/IECEx 05 No (00)

Cables: PFA high-temperature (232℃) FEP (177℃)

Price: Approximately 35% - 40% higher than standard

Six, Selection Tips

This model: Long housing (101.6mm) + 7.5mm optical rod + 1m high-temperature cable + ATEX explosion-proof, suitable for high temperature (200–232℃) + hazardous area + formal installation scenarios.

Common variants:

330191-40-75-05-05 (0.5m, explosion-proof)

330191-40-75-10-00 (1m, no explosion-proof)