Dwyer Series PUF - Manual (Page 5)

1: General Description
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1: General Description
1.1 Introduction
This manual describes the operation of the Dwyer PUF 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 PUF 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 197 inches
(13 to 5000 mm) and constructed of almost any material. The instrument will also operate over a wide range of
fluid temperatures.
Easy to operate, the PUF standard features are:
• Large, easy to read graphic display with backlighting.
• Simple to follow dual function keypad.
• Simple ‘Quick Start’ set up procedure.
• 98k stored data points.
• Continuous signal monitoring.
• RS232 output.
• USB output.
• 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 PUF applications include:
• River water.
• Seawater.
• Potable water.
• Demineralized water.
• Treated water.