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User’s Guide
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CDH-7X
Conductivity/Total Dissolved
Solids Pocket Tester
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GENERAL DESCRIPTION
The CDH-7X Conductivity/Total Dissolved Solids Tester is an economical, portable handheld
unit, ideal for quick field checks of water-based solutions. It features large display (0.5”-
12.7mm), for easy reading, automatic temperature compensation, and calibration trimmers. All
readings are referenced to 25°C using a 2% per °C temperature coefficient. The CDH-7X
displays Conductivity in microsiemens/cm and millisiemens/cm, or Total Dissolved Solids in
ppm and ppt (1ppm=2uS/cm).
Caution: Never immerse the tester more than 2 inches from the sensor tip.
OPERATING PROCEDURE
1. Remove the protective cap.
2. Turn the CDH-7X on using the ON/OFF switch located on
the top right side of the unit. Check display units of
measure for TDS or Conductivity, to change gently slide
green case, and using the enclosed screwdriver you can
switch between TDS and Conductivity from the switch
below the battery compartment.
3. With a clean probe the unit should read 00 in air, ...zero
conductivity.
4. Select the range for the solution to be measured from the
range switch.
Start with the range switch at the left position for the
narrowest range. If the reading displays 1---, the solution
is Overange, and change the next range to the right.
5. Dip the CDH-7X to the immersion level, and stir gently,
allowing few seconds for the reading to stabilize.
6. If the reading is off, clean the stainless steel electrodes
periodically with a mild detergent or solvent (i.e.alcohol)
because oily solutions can built up. Clean the electrodes
before recalibration.
7. Units are shipped factory calibrated; however, should
calibration be required, use the enclosed screwdriver and
GENTLY adjust the “Z” zero and “S” span adjustments
are on the left side of the Range Switch. Start by checking
and adjusting zero in air if needed, then immerse the unit
in a standard solution of a known value.The value of this
solution should be close to that of the solution to be
measured. To calibrate adjust the span trimmer until the
display matches the value of the standard solution.
8. When not in use, switch off the instrument
electrode with distilled water, shake off any excess, and
replace the protective cap.
. Rinse the
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CHANGING BATTERIES
Remove the green plug-in electrode by pressing the green tab above the pocket clip. Replace
old batteries with fresh ones. The notice polarity is shown in the battery compartment.
SPECIFICATIONS
Range:
Cond. 0 to 199 µS/cm 0.00 to 1.99 mS/cm 0.0 to 19.9 mS/cm
TDS 0 to 199 ppm 0.00 to 1.99 ppt 0.0 to 19.9 ppt
Resolution: 1µS/cm or ppm 0.01mS/cm or ppt 0.1mS/cm or ppt
Accuracy: ±2% of full scale
±4µS/cm or ppm ±0.04mS/cm or ppt ±0.4mS/cm or ppt
Electrodes: Stainless steel
Operating
Temperature: 0 to 70°C (32 to 158°F), Automatic Temperature Compensation uses a
precision temperature sensor with 2% per °C temperature coefficient;
readings are referenced to 25°C.
Display: 2 1/2 digits 12.7mm (0.5”) high LCD
Battery: Three 1.35V (included) EVEREADY 357
Battery Life: 50 hours continuous
Dimensions: 152 x 43 x 23mm (6”H x 1.7”W x 0.9”D)
Weight: 113 g (4 oz)
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WARRANTY/ DISCLAIMER
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of one (1) year from the date of purchase. In addition to OMEGA’s
standard warranty period, OMEGA Engineering will extend the warranty period for one (1) additional year if the warranty card enclosed with each instrument is returned to
OMEGA.
If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service Department will issue an Authorized Return (AR) number immediately upon
phone or written request. Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to
defects resulting from any action of the purchaser, including but not limited to mishandling, improper interfacing, operation outside of design limits, improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of having been damaged as a result of excessive corrosion; or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating conditions outside of OMEGA’s control. Components which wear are
not warranted, including but not limited to contact points, fuses, and triacs.
OMEGA is pleased to offer suggestions on the use of its various products. However, OMEGA neither assumes responsibility for any omissions or errors nor
assumes liability for any damages that result from the use of its products in accordance with information provided by OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by it will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY
KIND WHATSOEVER, EXPRESS OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of purchaser set forth herein are exclusive, and the
total liability of OMEGA with respect to this order, whether based on contract, warranty, negligence, indemnification, strict liability or otherwise, shall not exceed the
purchase price of the component upon which liability is based. In no event shall OMEGA be liable for consequential, incidental or special damages.
CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic Component” under 10 CFR 21 (NRC), used in or with any
nuclear installation or activity; or (2) in medical applications or used on humans. Should any Product(s) be used in or with any nuclear installation or activity, medical
application, used on humans, or misused in any way, OMEGA assumes no responsibility as set forth in our basic WARRANTY/ DISCLAIMER language, and, additionally,
purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the Product(s) in such a manner.
RETURN REQUESTS/INQUIRIES
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER
MUST OBT AIN AN AUTHORI ZED RETURN (AR) N UMBER FROM OMEG A’S CUSTOME R S ERVICE DEPA RTMENT (IN ORD ER TO AVOID PROCE SSING
DELAYS). The assigned AR number should then be marked on the outside of the return package and on any correspondence.
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in transit.
FOR WARRANTY RETURNS, please have the following information available
BEFORE contacting OMEGA:
1. Purchase Order number under which the product was PURCHASED,
2. Model and serial number of the product under warranty, and
3. Repair instructions and/or specific problems relative to the product.
OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords our customersthe latest in technology and engineering.
© Copyright 2008 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied, reproduced, translated, or reduced to any
electronic medium or machine-readable form, in whole or in part, without the prior written consent of OMEGA ENGINEERING, INC.
It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing certification of its products to the
European New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.
FOR NON-WARRANTY REPAIRS,
the following information available BEFORE contacting OMEGA:
1. Purchase Order number to cover the COST of the repair,
2. Model and serial number of product, and
3. Repair instructions and/or specific problems relative to the product.
TRADEMARK NOTICE:®, omega.com®, are Trademarks of OMEGA ENGINEERINGS, INC.
PATENT NOTICE: This product is covered by one or more of the following patents:
No. Des. 336,895; 5,274,577/ CANADA 2052599; 2052600 / ITALY 1249456; 1250938 / FRANCE BREVET No. 91 12756 / SPAIN 2039150; 2048066 / UK
PATENT No. GB2 249 837; GB2 248 954 / GERMANY DE 41 34398 C2. Other US and International Patents pending or applied for.
U.S. Patents Des. 351,803; /CANADA 74,336. Used under license.
consult OMEGA for current repair charges. Have
U.S. Pat.
M2402/0708
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