Gas Sampling
EXO Pump has four inlets to enable flexibility in gas sampling.
The EXO 8 Pump configuration is not compatible with the following gases: Chlorine (Cl2), Chlorine Dioxide (ClO2), Hydrogen Cyanide (HCN), Hydrogen Fluoride (HF), and Ozone (O3).
Single Gas Sampling Inlet
When one inlet is toggled on, EXO continuously draws air in from that inlet.
If you start the pump while operating at temperatures of -20°C (-4°F) or lower, EXO generates a pump blocked alarm (see section 11.4) 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 first purges for two minutes to clear out any gas from the sensors, then draws air from the inlet that is 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 starts a sampling cycle.
To ensure you always know where gas exposures are coming from, EXO only pulls in gas from one inlet at a time. Note that when multiple inlets are toggled on, EXO goes through each inlet, one at a time.
EXO also purges in between each of the samples to displace gas from the previous sample. While EXO is purging itself, there are 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 (three-minute sample time + two- minute purge time), there is a 20 minute gap between readings from a given inlet.
You can extend the sample time in EXO's configuration profile in Blackline Live. See 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. See the Blackline Live Technical User Manual for instructions.
