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®
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CDH-95
O
N
O
FF
F
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1
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2500
2500
®
Resistivity Meter
Operator’s Manual
Page 2
Servicing USA and Canada: Call OMEGA Toll Free
®
USA Canada
ne Omega Drive, Box 4047 976 Bergar
O
Stamford, CT 06907-0047 Laval (Quebec) H7L 5A1
elephone: (203) 359-1660 Telephone: (514) 856-6928
T
FAX: (203) 359-7700 FAX: (514) 856-6886
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Sales Service: 1-800-826-6342 / 1-800-TC-OMEGA
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5 Swannington Road, Broughton Astley, Leicestershire
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Telephone: 44 (1455) 285520 FAX: 44 (1455) 283912
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Page 3
OMEGA warrants this unit to be free of defects in materials and workmanship and to give satisfactory service for a period of 13 months from
ate of purchase. OMEGA Warranty adds an addit ional one (1) month
d
grace period to the normal one (1) year product warranty to cover
hand ling and shipping time . T his ensures that OMEGA ’s custo mers
ec ei ve max im um co verag e on eac h pro duct. If th e uni t sho ul d
r
malfunction, it must be returned to the factory for evaluation. OMEGA’s
usto mer Servic e D epart ment will issue an Authori zed Return (AR)
C
umber immediately upon phone or written request. Upon examination
n
by OMEGA, if the unit is fo und to be defective it w ill be repair ed o r
eplace d at no charge. How ever, this WARRANTY is VOID if the unit
r
shows evidence of having been tam pered with or shows evidence of
bein g d amaged as a re sult of e xcess ive corrosion; or cu rrent, heat ,
oisture or vibration; improper specification; misapplication; misuse or
m
other operating conditions outside of OM EGA’s control. Components
which wear or which are damaged by misuse are not warranted. These
nclude contact points, fuses, and triacs.
i
MEGA is glad to offer sugg estions on the use of its various
O
produc ts. Nev ertheles s, OMEG A only warran ts that the parts
anufactured by it will be as specified and free of defects.
m
OME GA M AKES NO OTHE R W ARRANTIES OR REP RESE NTATIONS OF ANY KIND WHATSOEVER, EXPRESSED OR IMPLIED,
XC EP T T HA T O F TI TLE A ND AL L IM PLI ED W ARR AN TI ES
E
IN CLU DIN G A NY WA RRA NT Y O F M ERC HA NTA BIL IT Y A ND
IT N ES S FO R A P AR T IC UL AR PU R PO SE A R E HE RE B Y
F
DISCLAIMED.
LIMITATION OF LIABILITY: The remedies of purchaser set forth
her ein are ex clus ive and th e to tal lia bil ity of OMEGA w ith
resp ect t o thi s or der, wheth er ba sed o n contract , war ranty ,
negligence , indemnifi cation, str ict liability or o therwise, shall
not ex ceed the purchase price of the c omponent u pon which
li ab il ity i s b as ed . I n no ev en t s ha ll OM EG A be li ab le fo r
consequential, incidental or special damages.
Every precaution for accuracy has been taken in the preparation of this
ma nua l; ho wev er, OM EG A EN GIN EER IN G, INC . neithe r assu me s
responsibility for any omissions or errors that may appear nor assumes
liability for an y da mages that result from the use of the produc ts i n
accordance with the information contained in the manual.
SPECIA L CONDITION: Should this equipment be used in or with any
nuclear installation or activ ity, purchaser will indemnify OMEGA and
hold OMEGA harmless from any liability or damage whatsoever arising
out of the use of the equipment in such a manner.
RETURN REQUESTS / INQUIRIES
Direct all warr anty an d repair requ ests/inquiries to th e OMEGA ENGINEER ING Custome r S ervice Depa rtment . B EFORE RETUR NING ANY
PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED
RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR
number should then be marked on the outside of the return package and
on any correspondence.
WARRANTY
FOR WARRANTY
please have the following information available BEFORE contacting OMEGA:
1. P.O. number under which the
product was PURCHASED,
2. Model and serial number of
the product under warranty,
and
3. Repair instructions and/or spe
cific problems relative to the
product.
OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords our customers the latest
in technology and engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 1995 OMEGA ENGINEERING, INC. All rights reserved. This
documentation may not be copied, photocopied, reproduced, translated,
or reduce d t o a ny electro nic medium or machine-read able form, in
whole or in part, without prior written consent of OMEGA ENGINEERING, INC.
RETURNS,
FOR NON-WARRANTY REPAIRS OR
CALIBRATION
current repair/calibration charges.
Have the following information
available BEFORE contacting
OMEGA:
1. P.O. number to cover the COST
of the repair/ calibration,
2. Model and serial number of
product, and
3. Repair instructionsand/or specific
problems relative to the product.
,
consult OMEGA for
Page 4
Where Do I Find Everything I Need for
Process Measurement and Control?
OMEGA...Of Course!
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onnectors, Panels & Assemblies
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ecorders, Controllers & Process Monitors
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M2265/0595 12956ML-99
Page 5
T
ABLE OF
CONTENTS
Section 1 Unpacking ................................ 2
Section 2 General Description ................... 3
Section 3 Setting Up the Meter ................. 4
CDH-95
Resistivity Meter
Page
Installing the Battery ................................. 4
Section 4 Operating Instructions ............... 5
Section 5 Operating Tips ............................6
Section 6 Calibrating the Meter ................ 7
Section 7 Specifications ............................. 8
1
Page 6
CDH-95
Resistivity Meter
Unpacking
Remove the Packing List and verify that you
have received all equipment, including the
following (quantities in parentheses):.
1 soft carrying case
1 9V alkaline battery
1 Operator’s Manual
The carrying case contains the following:
1 small screwdriver
1 CDH-95
If you have any questions about the shipment,
please call the OMEGA Customer Service
Department.
When you receive the shipment, inspect the
container and equipment for signs of damage.
Note any evidence of rough handling in
transit. Immediately report any damage to the
shipping agent.
The carrier will not honor
damage claims unless all
shipping material
is saved for inspection. After
examining and removing
contents, save packing
material and carton in the
event reshipment is
necessary.
2
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Resistivity Meter
Resistivity cell
Do not immerse below
electrode cap
Cell pivot hinge
LCD Display
and annunciators
x 10
Lo Batt
ON/OFF button
Zero
Resistivity adjustment
potentiometers:
Battery compartment
9V transistor battery
Battery
compartment
door
x
10
2500
2500
Span
ON
OFF
F
/
R
Range selector switch
Temperature switch
ATC
Fix 25°C
General Description
The OMEGA®CDH-95 measures
resistivity across three ranges from ∞ to
200K, 20K, and 2K Ohms/Cubic Inch
which makes it an excellent choice for
spot checking the resistivity of samples
ranging from ultra-pure water to tap
water especially useful for quality control
in electronics assembly.
Parts of the Meter
CDH-95
Figure 1. Parts of the Meter
3
Page 8
ON
OFFFR
Battery
Compartment
Battery
Battery
Compartment
Door
Battery
Terminals
2
1
CDH-95
Resistivity Meter
Setting Up the Meter
Installing the Battery (Fig 2)
Carefully remove the meter from the
carrying case making sure you don’t lose
the small screwdriver.
To install/change the battery, do the
following:
1. Insert your thumb in the recessed
area of the battery compartment
door and pull it away from the
display.
2. Snap the 9V alkaline battery into the
battery clip.
3. Place the battery clip/battery
assembly at the top of the battery
compartment.
3. Replace the battery compartment
door and snap into place.
4
Figure 2. Installing the Battery
Page 9
CDH-95
Resistivity Meter
Operating Instructions
1. Slide the battery compartment
door open to reveal the
temperature switch
2. Push the switch to the ATC
(forward) position.
3. If non-temperature compensated
readings are desired, put the
temperature switch in the FIXED
25°C position.
4. Energize by depressing the
ON/OFF switch once
5. Immerse cell into the solution
approximately
6. When energized, the LCD will
indicate the resistivity range being
measured.
7. The CDH-95 measures 3 ranges
of resistivity in the following
sequence; 0 to 200K, 0 to 20K,
and 0 to 2K & ohms/in.
each range change desired,
depress the F/R switch once.
8. Agitate electrode briefly and
record the reading.
9. A 1 will appear in the indicator if
the solution exceeds the
measurement range.
10. After each use, clean and rinse
the resistivity cell with distilled
water.
1
/2 its length.
3
. For
5
Page 10
CDH-95
Resistivity Meter
Operating Tips
1. The electrode should be rinsed
thoroughly after each test.
2. When possible, test samples of a
higher resistivity value first.
3. If resistivity cell does not "1---" in
the air, it may indicate dried
solids on the sensing portion of
the cell. Clean with a mild
detergent solution, remembering
not to use abrasive materials that
might scratch the sensors surface.
4. When possible, choose resistivity
calibration solutions with values
that are near the samples
normally being measured.
5. If the instrument will be stored for
long periods of time, remove the
battery.
6
Page 11
CDH-95
Resistivity Meter
Calibrating the Meter
Your instrument has been pre-calibrated
prior shipment. Calibrations should be
performed periodically with known
resistivity solutions.
1. Clean the cell thoroughly by agitating in
distilled water prior to calibration.
2. Wipe off and allow the cell to dry.
3. Once dry, resistivity should read 0 when
2 pins in cell are shorted.
4. Adjust the "Zero" pot to zero if the
reading is incorrect.
5. Immerse the cell in a known resistivity
solution, adjust the span pot to
corresponding resistivity value.
6. Only a single point calibration in the
200K range is required to standardize.
However, if the unit is to be used
primarily in a higher or lower range, it is
recommended that the single point
calibration be performed near point of
use and in the correct range for best
accuracy and resolution.
7. Rinse the cell in distilled water.
7
Page 12
CDH-95
Resistivity Meter
Specifications
Range: ∞ to 200K, ∞ to 20K, ∞ to
2K Ohm/Cubic inch
Accuracy: ± 2% of full scale
Temperature
Compensation: 0 to 82°C
Accuracy: 0.0 to 50°C, ±0.01%
50 to 82°C, ±0.03%
Power: 9V Battery
8
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