Identity

• Brand:​ Maxtec (USA)

• 

• Model:​ MAX-250E

• Reference / Part No.:​ R125P03-002​ (commonly shortened to 25P03-002​ or listed as 0110429)

• Type:​ Galvanic oxygen sensor (electrochemical cell, non-pumped)

• Electrolyte:​ Proprietary weak-acid formula (resistant to CO₂, CO, NOx — superior to traditional KOH cells)

• Country of origin:​ Made in USA

• Shelf warranty:​ 24 months (storage life, not powered operating life)

Electrical & Performance

• Measurement range:​ 0 – 100 % O₂

• Output signal:​ 10.0 – 15.5 mV​ (in air @ 21% O₂ ≈ 2.1–3.3 mV)

• Zero offset:​ ≤ 0.50 mV​ (in 100% N₂, 5 min exposure)

• Linearity:​ ±1.0% of full scale

• Response time (T90):​ ≤ 15 s​ at 23 ± 2 °C

• Temperature compensation error:​ < ±3.0% (15–40 °C)

• Expected life:​ > 1,500,000 %O₂·hours​ (theoretical ≈ 8 yrs in air; actual consumption by powered hours)

• Recommended load:​ > 1 MΩ

• Interference compliance:​ EN ISO 80601-2-55 (insensitive to CO₂, CO, NOx)

Environmental

• Operating temp:​ 5 – 40 °C

• Storage temp:​ -15 – 50 °C (label recommends 5 – 25 °C)

• Humidity:​ 5 – 95 % RH, non-condensing

• Pressure:​ ~0.5 – 1.5 atm

Mechanical & Interface

• Body:​ Cylindrical probe, Ø ≈ 0.9 cm, length ≈ 5.74 cm

• Gas port:​ M16 × 1 thread (side-stream sampling inlet)

• Electrical connector:​ 3.5 mm mono phone jack​ (tip positive, sleeve negative, 2-wire)

• Weight:​ ≈ 50 g (net)

Direct OEM Cross-References

• Analytical Industries: PSR-11-917-J1

• CareFusion / Viasys: Sentry Blender 66045

• Covidien Newport: E360 / HT70 / e500

• Fluke: VT Mobile

• Mercury Medical: 10-103-08

• Pacifitech: PT-25A

• Teledyne: R29MED (C-70592)

• Maxtec family: MaxO2+AE, OM-25AE, OM-25ME, MaxBlend, MaxVenturi

Typical Applications

• Ventilators (Bird, Newport, etc.)

• Anesthesia machines (FiO₂ monitoring)

• Air-oxygen blenders

• Portable oxygen analyzers (e.g., MaxO2+AE external probe)

⚠️ Ordering note: always specify “Maxtec MAX-250E, REF R125P03-002 (25P03-002)”. “MAX-205E” is a typo — MAX205E is a Maxim RS-232 transceiver IC, unrelated to O₂ cells. Output 10.0–15.5 mV is the MAX-250E value; older OM-series cells rated 8.5–13.5 mV must not be mixed in.