Dwyer Series PUB - Manual (Page 5)

1: General Description
1
1: General Description
1.1 Introduction
This manual describes the operation of the Dwyer PUB portable flowmeter. The flowmeter is designed to work
with clamp-on transducers to enable the flow of a liquid within a closed pipe to be measured accurately without
needing to insert any mechanical parts through the pipe wall or protrude into the flow system.
Using ultrasonic transit time techniques, the PUB is controlled by a micro-processor system which contains a
wide range of data that enables it to be used with pipes with an outside diameter ranging from 0.5 to 40 inches
(13 to 1000 mm), depending on model, and constructed of almost any material. The instrument will also operate
over a wide range of fluid temperatures.
The PUB series comprises two models which are identical in operation but designed to be used with a different
range of pipe diameters. The PUB-A can be used with pipes in the range 0.5 to 4.5
inches (12.7 to 114 mm) and
the PUB-B with pipes in the range 2 to 40 inches (50.8 to 1016 mm).
Easy to operate, the PUB standard features are:
• Large, easy to read graphic display with backlighting.
• Simple to follow dual function keypad.
• Simple ‘Quick Start’ set up procedure.
• Continuous signal monitoring.
• Pulse output volumetric or frequency).
• 4 to 20 mA, 0 to 20 mA, or 0 to 16 mA output.
• Rechargeable battery.
• Battery management.
• Diagnostics.
Volumetric flow rates are displayed in L/h, L/min, L/sec, gal/min, gal/h, USgals/min, USgals/h, Barrel/h, Barrel/
day, m³/s, m³/min, m³/h. Linear velocity is displayed in meters or feet per second.
When operating in the ‘Flow Reading’ mode the total volumes, both positive and negative, are displayed up to a
maximum 12-digit number.
The flowmeter can be used to measure clean liquids or oils that have less than 3% by volume of particulate
content. Cloudy liquids such as river water and effluent can be measured along with cleaner liquids such as
demineralized water.
Typical PUB applications include:
• River water.
• Seawater.
• Potable water.
• Demineralized water.
• Treated water.