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## From Watts

50 Cross-Connection Questions, Answers & Illustrations explains the causes, consequences and prevention methods of backflow relating to safe drinking water.

##### Products & Services
Diaphragm Valves
Diaphragm valves close by means of a flexible diaphragm attached to a compressor.
Diverter Valves
Diverter valves direct flow from one inlet to one of two or more outlets.
Gas Valves
Gas valves are used to handle and control the flow of gaseous media such as liquefied petroleum and natural gas. They are made of metal or plastic and vary in terms of valve size, pressure rating, number of ports, and flow.
Tempering Valves and Thermally Actuated Valves
Tempering valves and thermally actuated valves contain a thermal sensing component that opens or closes in response to temperature changes.
Drain Valves
Drain valves are designed to automatically remove liquids from process lines as necessary.

##### Product Announcements
KEW SNAP 2002PA AC Digital Clamp Meter Can measure large AC current up to 2000A. Peak hold function. 55mm-dia large tear drop shaped jaws. (read more)
KEW 2431 Leakage Clamp Meter Frequency Selector Switch to eliminate the effect of harmonics. Three AC current ranges 20mA/200mA/200A. Rotary switch for easy one finger power-on and range... (read more)

##### Topics of Interest

A wideband current monitor consists of two halves that clamp together over a conductor, offering measurement convienience from near DC to 15 MHZ.

Ammeters The problem in this section illustrates the difference in ac and dc current measurement. Problem 2-16: AC AND DC AMMETERS Q: In the circuit below an ac and a...

CT's provide an isolated, accurate measurement of the current in the primary. Usually CT's have a one turn primary - a conductor that is part of the circuit being measured. CT's have very little...

8.7 Electrical design considerations This section will deal with the key electrical design considerations necessary to select the appropriate conductor for a given application. These are the...

Common electrical parameters that require calibration equipment include voltage, current, resistance, and capacitance. Equipment is needed to measure the outputs of transducers and signal conditioners...

Product Announcements
Valcor Engineering Corporation
Tantaline
Dwyer Instruments Inc.