User's Manual

G7 TECHNICAL USER MANUAL || 29
What is ow rate?
Flow rate is the speed at which air is passing over your device’s sensors. In order to
provide accurate gas readings, ow rate needs to be above 150 ml/min. A ow rate less
than 150 ml/min will result in a pump block yellow warning alarm. By default, Blackline’s
pump aims to maintain a ow rate of 300ml/min and G7 will automatically adjust its
pump speed to maintain this rate.
PUMP OPTIONS
Settings for pump can be found in G7’s main menu, under settings > pump options.
What is the sample timer?
The sample timer is the amount of time it takes for one air sample to be pumped to
your sensors. This calculation is based on your hose length. If sample timer is enabled,
the pump status screen will show a countdown and beep once when a sample cycle
has completed. The sample cycle will repeat continuously until you turn pump o. If
disabled, the sample timer will not show and the device will not beep, and pump will
continue to function normally. Blackline recommends a 120 second sample time for 10
feet of tubing, with an additional second per foot of tubing.
How do I enable or disable the sample timer?
1. Press OK to enter G7’s main menu
2. Use the up and down arrows to navigate to settings, press OK
3. Use the up and down arrows to navigate to pump options, press OK
4. The menu will display the current status of your sample timer. Select
sample timer o or sample timer on.
5. Select yes to conrm that you would like to enable or disable the sample timer
What is hose length?
Hose length is an estimate of how long the tubing attached to pump is. This value is
customizable from the pump options menu, and factors in to sample time. G7’s multi-
gas pump cartridge supports a maximum of 99 feet of tubing.
How do I change hose length?
1. Press OK to enter G7’s main menu
2. Use the up and down arrows to navigate to settings and press OK
3. Use the up and down arrows to navigate to pump options and press OK
4. Select hose length
5. Use the up and down arrows to choose your units, meters or feet, and press OK
6. Use the up and down arrow to enter the first digit of your length and press OK
7. Use the up and down arrow to enter the second digit of your length and press OK
8. Select yes to confirm your length or select edit to make changes to your choice