· Instrument Books ·





Purdy’s Instrument Handbook (104 pages) has been the favorite instrument reference book for craftsmen and instrument specialists since 1996.  It contains conversion factors, hookup diagrams, formulas, calibration information and lots of helpful reference data.


Purdy’s Instrument Handbook #2 (104 pages)  contains all NEW and Different material from the original Purdy's Instrument Handbook.   It includes plenty of instrument solutions and answers, tricks of the trade, formulas, loop designs and useful reference data.


Dewey’s Instrument Troubleshooting Handbook (104 pages) was published in 2001 and already it has become a popular resource.  It contains startup and checkout pointers, tricks of the trade, rules of thumb and lots of ideas for solving problems.  It contains plenty of troubleshooting techniques, tips and examples. 


About the Author:

Ralph Dewey has worked as an instrument craftsman, training coordinator and maintenance specialist for over 30 years.  He is an ISA Level III Certified Control System Technician and has taught instrument courses at San Jacinto College and Lee College. 

 Ralph Dewey is available for Instrument seminars and lectures at your location.

 We now offer custom Instrument Training Units  built to your specifications.  These miniature process units can be for pressure, flow, level and temperature loops.  They can be designed for the brand of instruments that you need and with many options such as HART transmitters, cascade processes and with load disturbances for tuning challenges.  The Instrument Training Units can be used to teach troubleshooting, loop tuning, process control and electrical safety.  Call to discuss your training unit needs and get a quote at (281) 479-2759.

Prices and Ordering Information:

Glen Enterprises                Email:        purdys@flash.net

PO Box 1201                    Phone:        (281) 476-9997 or (281) 479-2759   Call during regular business hours (9AM to 5PM CST, Monday through Friday)

Deer Park, TX 77536          Fax:          (281) 476-9997


Purdy’s Instrument Handbook ------------------------         $13.50 + tax

Purdy’s Instrument Handbook #2 ---------------------         $13.50 + tax

Dewey’s Instrument Troubleshooting Handbook ----------          $13.50 + tax


Add 7.25% Texas State Sales Tax (for Texas residents only)

Retail prices are postpaid (you add nothing for shipping)

Contact us about volume and wholesale discounts

We accept Mastercard, Visa and Discover credit cards.  

Be sure to include card holder’s full name and address, card number,

the card’s expiration date and your phone number.

We accept company purchase orders.

We accept checks.  Once they clear, we ship your books.


·Copyright 2014 Ralph Dewey ·