68X256901 Rev 1 10/99
EUTECH INSTRUMENTS
2-Wire pH or ORP Transmitter
Operating Instructions
1
Preface
Thank you for purchasing the Eutech pH or ORP Transmitter.
This manual serves to explain the correct installation and operations of
the XTR Transmitters. Other Transmitters available individually are: pH,
ORP (REDOX), Conductivity, Dissolved Oxygen and Temperature.
•
EC-PH-XTR;
•
EC-ORP-XTR;
•
EC-CON-XTR;
•
EC-DO-XTR; and
•
EC-TEMP-XTR.
The information presented in this manual is subject to change without
prior notice, as improvements are made to the product. While Eutech will
endeavor to try its best to inform the market, this does not represent a
commitment on the part of Eutech Instruments Pte Ltd.
Eutech Instruments does not accept any responsibility for damage or
malfunction of the unit due to improper installation or operation of the
Transmitter.
Copyright
1999 Eutech Instruments Pte Ltd. Version 1.0. All rights
reserved.
Eutech Instruments Pte Ltd. Blk 55 Ayer Rajah Crescent #04-14/24,
Singapore 139 949. Tel: (65) 778 6876; Fax: (65) 773 0836; e-mail:
Home page:
http://www.eutechinst.com
2
Introduction
The Transmitter is used for the continuous measurement of pH, ORP
(REDOX), Conductivity, Dissolved Oxygen or Temperature, in conjunction
with an appropriate sensor. Data output is via 4-20 mA current output.
The Transmitter is housed in a IP65 enclosure, with openings for input
and 4-20mA output.
3
Diagram and Dimensions (in mm)
4
Installation
Operating with one or several Transmitters:
Figure 1 - Operating with 1 Transmitter
Figure 2 - Operating with several transmitters
5
Electrical Connections
NOTE: In electrically “noisy” environments, select ‘Symmetrical’ mode of
operation and connect a stainless steel rod (Potential Matching
Pin - PMP) as shown above. Ensure both the PMP and pH or
ORP electrodes are immersed into the solution, even when
performing calibration.
6
Before Calibration
Remove cover of Transmitter and ensure that electrode is correctly
connected as above. Connect Amp meter to the 4/20mA output of
Transmitter (Appendix 1).
7
pH Transmitter Calibration
1)
Calibrate in pH 7.00 buffer first
, and then in either pH 4 or pH 10.
2)
First, immerse clean pH electrode into a container with fresh pH 7.0
buffer solution;
