GBC MasterPurge Welding Purge Gas Oxygen Monitors
- Power Source
- P3 9 V battery / 2 x AAA batteries
- Accuracy / Resolution
- 0.1 % / 0.01
- Sensor Warranty
- 12 months
- Dimensions (Case)
- 270 x 230 x 55 mm
Features
- Two models: MasterPurge 100 and MasterPurge 100X
- Measuring range: MasterPurge 100 20.9 – 0.01 %, MasterPurge 100X 20.94 – 0.01 % (100 PPM)
- Supplied complete with carrycase, hose, aspirator bulb and stainless steel probe
GBC MasterPurge Welding Purge Gas Oxygen Monitors
Specifications / Models
| Stock Code | Description | Power Source | Measuring Range | Accuracy / Resolution | Sensor Warranty | Dimensions (Case) | Dimensions (Monitor) | Sensor Response | Operating Temperature | Weight | Body Material | IP Rating | Shipping Dimensions | Shipping Weight |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| GBC-MP100 | GBC MasterPurge 100 Portable Oxygen Monitor | P3 9 V battery | 20.9 – 0.01 % | 0.1 % | 12 months | 270 x 230 x 55 mm | 150 x 80 x 55 mm | T90 < 15 s | -10 – 40 °C | — | — | — | — | — |
| GBC-MP100X | GBC MasterPurge 100X IP65 Weld Purge Monitor | 2 x AAA batteries | 20.94 – 0.01 % (100 PPM) | 0.01 | — | — | — | — | — | 0.365 kg | Aluminium | IP65 | 23 x 24 x 9 cm | 1.1 kg |
Machine concepts
On the basis of the following machine concepts we find the optimum solution for you:

The MasterPurge 100 is an easy to use entry level weld purge monitor.
It comes complete and ready to use straight from the carrycase. It is handheld, portable and ideal for the pipefitter’s toolbox. Instructions are permanently on display inside the carrycase lid and the large 4 digit display is easy to view.
Its measuring range of oxygen in atmosphere is 0.01% to 20.9% and it accurately measures the concentration of oxygen to 0.1%.
Saves time and improves weld quality when welding stainless steel & Duplex pipework.
- Oxygen monitor
- Hose
- Flow adapter
- Stainless steel probe
- Aspirator bulb
- Carrycase
- Operating instructions

GBC’s MasterPurge 100X Weld Purge Monitor is a high quality, simple to operate handheld gas analyser measuring oxygen content in weld purge operations down to 0.01% O2 content (100PPM).
Housed in a machined aluminium case, the MP100X is a robust, reliable, and revolutionary product suitable for most weld purging operations on stainless steel, duplex, super duplex and other alloy steel materials.
- Sensor reading from atmosphere 20.94% O2 to 0.01% (100PPM).
- Robust enclosure constructed from machined aluminium. Splashproof and dustproof – IP65 rated protection from dust and moisture.
- Innovative single button self-calibration as standard.
- Easy to read, enlarged LCD screen allows user to monitor levels easily.
- HF Guard protects the electrical components from high frequency voltage used in TIG/GTAW.
- Long life sensor with operational lifespan of up to 12 months.
- Handheld purge monitor, perfect for both workshop and site operations.
- Easy install TruSeal push fit hosing for convenient repacking after use.
- Suitable for most stainless steel, duplex, super duplex and chrome steel TIG/GTAW welding applications.
- MasterPurge 100X Weld Purge Monitor.
- MP100XS high resolution, long life, self-calibrating electrochemical zirconium sensor (fitted to unit).
- Machined aluminium sensor cover and push fit connectors.
- Manual vacuum sampling bulb and hose.
- Stainless steel sampling probe fitted with 2 metres of hose.
- High impact ABS plastic storage/transport case with ‘snug fit’ foam inserts.
- Calibration test certificate.
- Declaration of conformity to CE (768/2008/EC) & UKCA (EN ISO 17050-1:2010).
- User manual with operator instructions, parts breakdown and troubleshooting.
- 2 x AAA alkaline batteries.
Source: the manufacturer's brochure
Product Description
GBC MasterPurge portable weld purge monitors measure the oxygen level in weld purging operations; they save time and improve weld quality when welding stainless steel and duplex pipework. Two models are available: the easy to use, entry level MasterPurge 100 and the IP65 rated MasterPurge 100X in a machined aluminium case. Both are handheld and portable.


