Thermo-paramagnetic oxygen analyzer for safe areas
A lightweight oxygen analyzer for cost-effective quality control in safe area applications, such as monitoring oxygen purity. Using Michell’s tried and tested Thermo-Paramagnetic oxygen sensing technology the XTP501 has no consumable parts to replace and offers users an extremely low cost of ownership due to minimal maintenance needs.

The analyzer version features an intuitive user interface for easy set up and use.

Product Features

  • Compact, lightweight and easy to install
  • Intuitive user interface
  • Tough IP55 housing
  • Low cost of ownership due to minimal maintenance
  • Measurement ranges from 0 to 1% up to 0 to 25% O2 and 20/80/90-100% O2
  • Accuracy of better than ±1% full scale
  • 2 x 4–20 mA outputs and MODBUS RTU over RS485 protocol as standard

3D CAD files (Step)


Technical Specification

Measurement TechnologyThermo-paramagnetic oxygen sensor
Measured GasOxygen (O2)
Background GasAnalyzer is calibrated in the background gas of the process. Standard backgrounds include N2, CO2, CH4, H2, He & BIOGAS.
Gas RequirementsNon-condensing sample with particles <3μm
Measurement RangeAnalyzer is calibrated to the range the customer requires. Select from:
0–0.5% up to 0-50% and 20, 80 or 90–100%
Display Resolution0.01%
0.1% for suppressed zero ranges
Display TypeBacklit LCD (not on 501-GP2 model)
Intrinsic Error (Accuracy)< ±1% of span or ±0.02% O2, whichever is greater
< ±0.2% O2 or 1% of range, whichever is greater (for suppressed zero ranges 20/80/90 to 100%)
Response Time (T90) with High Speed Response (HSR) Enabled< 15 seconds
Repeatability±0.2% of span or 0.02% O2, whichever is greater
Linearity±0.5% of span or 0.05% O2, whichever is greater
Zero Stability±0.25% of span per month
Span Stability±0.25% of span per month
Sample Flow Rate100 to 500 ml/min (0.2 to 1.27 scfh)
Sample Flow Effect (Calibrated at 300 ml/min)< 1% of span for flows within stated range
Sample Pressure0.75 to 2 Bar A (unit must be calibrated at the same pressure as sample)
Sample TemperatureA constant temperature between 5 and 55°C
Sample Cell Temperature+50°C
Electrical Specifications
Analog Inputs1 off mA input for an external sensor (can be displayed on the screen)
1 off mA input to act as an active compensation for the process conditions
Analog Outputs2 off 4-20 mA outputs (powered with 24V excitation voltage)
Output RangesPrimary range is set to the calibrated range of the instrument. The second is user-selectable
Alarms2 off single pole changeover relays for concentration (250 V, 5 A max)
DataloggingDigital communications can be used to log the output from the analyzer on an external device
Digital CommunicationsMODBUS RTU over RS485 Protocol
Power Supply24 V DC, 1.5 A max
Operating Conditions
Ambient Temperature+5 to +40°C
Mechanical Specifications
Warm-Up Time< 25 minutes (at 20°C ambient)
Stabilization Time5 minutes
Wetted Materials316 stainless steel, borosilicate glass, platinum, (plus O-ring)
Dimensions (w x d x h)260 x 180 x 128mm
WeightApprox. 3kg
O-Ring MaterialsViton
Gas Connection1/8” bulkhead standard
Ingress ProtectionIP55