Gas Sampling
EXO Pump is not compatible with the following gases: Chlorine (Cl2) and Chlorine Dioxide (ClO2).
Single gas sampling inlet
When one inlet is toggled on, EXO will continuously draw air in from that inlet.
If you start the pump while operating at temperatures of -20°C (-4°F) or lower, EXO will generate a pump blocked alarm (see Pump Blocked) that persists until the inlet warms up and begins operating normally. In a multiple inlet sampling cycle, the inlets do not have time to warm up. For temperatures below -20°C (-4°F), use only single gas sampling.
EXO will first purge for two minutes to clear out any gas from the sensors, then draw air from the inlet that has been turned on. When EXO draws from one inlet, it runs continuously from that inlet.
This setup is best for confined space entry, or any other situation where it is vital to continuously sample from a hazardous area.
Multiple gas sampling inlets
When multiple inlets are toggled on, EXO will begin a sampling cycle.
To ensure you always know where gas exposures are coming from, EXO will only pull in gas from one inlet at a time. Note that when multiple inlets are toggled on, EXO will need to go through each inlet one at a time.
EXO will also need to purge in between each of the samples to displace gas from the previous sample. While EXO is purging itself, there will be gaps in readings.
A sample cycle typically looks like the following:
Purge > Sample from inlet 1 > Purge > Sample from inlet 2 > Purge > Sample from inlet 3.
Due to these gaps in readings, a multiple-inlet sample setup is best used for long-term monitoring of remote areas.
Sample schedule
By default, the sample time from each inlet is three minutes. If you are running all four inlets with default settings (3 minute sample time + 2 minute purge time), there will be a 20 minute gap between readings from a given inlet.
The sample time can be extended in EXO's configuration profile in Blackline Live. Refer to the Blackline Live Technical User Manual for instructions.
Pump automatically
By default, pumps remain off when EXO starts. You can change the EXO configuration profile in Blackline Live so pumps automatically turn on when EXO starts. Refer to the Blackline Live Technical User Manual for instructions.
