14
Truck
BH
Survey PPM
In all instances, it is important that the sampling systems be leak tight.
Even slight leaks can compromise the accuracy and response time of a
mobile sampling system.
WARNING:
APPENDIX 1
MAIN SEQUENCES FOR OPERATION MODES
Bar Hole
Surv
Go
Mon
Truck Survey
∙
PPM
BH
(Mute)
Surv
CO/O
2
%Gas/Peak
BH
(Mute)
Zero/Off
PPM
Tr
BH
(Mute)
Zero/Off/Surv
APPENDIX 2
THE GAS-ROVER™ IN MOBILE SURVEYS
The Gas-Rover™ can easily be installed in a company’s vehicle if the sampling system
meets Bascom-Turner’s specifications. Vehicles that are currently using a Heath Detecto-Pak III
or IV for mobile surveys need minimal modification. Vehicles using older equipment or
equipment from other manufacturers, such as Dafrol or Southern Cross, need a more extensive
modification. For new vehicles, Bascom-Turner has available a mobile survey kit (Part No. MP-
001) which can be installed in about 4 hours.
MODIFICATIONS OF EXISTING SAMPLING SYSTEMS
The two chain and funnel assemblies that run from the front bumper should be about four
feet apart and centered. Adjust the funnel height to one inch above ground. Connect a flow meter
capable of displaying flows from 0 to 5 LPM (Dwyer RMA-26 or equivalent) to the tubing that
connects the pump to the instrument. Turn the adjustment knob on the outlet side of the pump to
read 3 LPM. Remove the flowmeter and connect the Rover to the outlet of the pump using the
special connector supplied by Bascom-Turner (Part No. MA-024). When using the Rover in a
mobile fashion, the unit must be set in the
Truck
mode.
MODIFICATIONS FOR OLDER SYSTEMS
Problems with older systems may be inadequate secondary pump volume and multiple
funnel assemblies. The funnel assemblies should be reworked to only two funnels set one inch
above ground. The secondary pump must be replaced with a larger pump supplied by Bascom-
Turner (Part No. HP-001).