Heath Consultants Hi Flow Sampler - Manual (Page 6)

Hi Flow

Sampler Introduction
6 Instruction 0055-9017
The main unit consists of an intrinsically safe, high-flow blower that pulls air from
around the component being tested through a flexible hose and into a gas manifold
located inside the unit. The sample is first passed through a venturi restrictor where the
measured pressure differential is used to calculate the sample’s actual flow rate. Next, a
portion of the sample is drawn from the manifold and directed to a combustibles sensor
that measures the sample’s CH
4
concentration in the range of 0.05 to 100% gas by
volume. A second identical combustibles sensor channel measures the background CH
4
level within the vicinity of the leaking component. The final element in the sampling
system is a blower that exhausts the gas sample back into the atmosphere away from
the sampling area.
The measured flow rate and the measured CH
4
levels (both leak and background levels)
are used to calculate the leak rate of the component being tested, with all measured
and calculated values being displayed on the hand-held control unit.
1.2 Material Supplied
• High Flow Sampler Unit
• Backpack
• 6 Foot, 1.5 Inch Hose Assembly
• Battery Pack (Qty. 2)
• Battery Charger w/ Power Supply
• Control Unit with LCD and 4-button keypad
• Assortment of Attachments (for complete capture of the gas leak)
• Flange Strap 34", 80", and 137"
• Capture Bag 36" x 36"
• Beveled Nozzle 6.5" and 24"
• Bag Nozzle
• Bellows Tool
• Claw Tool
1.3 Why Use the Hi Flow

Sampler?
• Allows ranking of gas leaks in leak-rate order
• Allows users to determine if the potential savings in lost gas by repairing a leak
• Allows users to determine payback periods for particularly expensive repairs
• Allows more cost-effective use of your maintenance budget
• Identifies problem areas
• Determines baseline leakage conditions
• EPA Best Management Practice Tool for Directed Inspection and Maintenance
Programs at Natural Gas Facilities
• Provides permanent record of leakage and repair
• Approved Measurement tool in conjunction with United Nations Framework
Convention on Climate Change Methodology 0023, Leak Reduction at Natural Gas
Facilities
• Pays for itself in recovered gas