fann 88C Bedienungsanleitung
Model 88C Resistivity Meter
Instruction Manual
Manual No. 207980, Revision F
Instrument No. 207960
© 2017 Fann Instrument Company, Inc
Model 88C Resistivity Meter Instruction Manual
©2017 Fann Instrument Company
Houston, Texas, USA
All rights reserved. No part of this work covered by the copyright hereon may be reproduced or
copied in any form or by any means (graphic, electronic, or mechanical) without first receiving the
written permission of Fann Instrument Company, Houston, Texas, USA.
Printed in USA.
The information contained in this document includes concepts, methods, and apparatus which may be
covered by U.S. Patents. Fann Instrument Company reserves the right to make improvements in
design, construction, and appearance of our products without prior notice.
FANN®and the FANN logo are registered trademarks of Fann Instrument Company in the United
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exclusive property of the respective manufacturers.
Contact Fann Instrument Company
Phone
1-281-871-4482
1- 800-347-0450
Fax
1-281-871-4358
Postal Address
Fann Instrument Company
P.O. Box 4350
Houston, Texas, 77210 USA
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Online
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Model 88C Instruction Manual
Table of Contents
1 Introduction...............................................................................................................4
1.1 Document Conventions ....................................................................................4
2 Safety .......................................................................................................................6
2.1 Battery Safety...................................................................................................6
3 Features and Specifications......................................................................................7
4 Operation..................................................................................................................9
4.1 Fluid Samples...................................................................................................9
4.2 Semisolid Samples.........................................................................................10
5 Troubleshooting and Maintenance..........................................................................12
5.1 Calibration ......................................................................................................12
5.2 Battery Replacement......................................................................................12
5.3 Cleaning.........................................................................................................13
6 Parts List.................................................................................................................14
7 Warranty and Returns.............................................................................................15
7.1 Warranty.........................................................................................................15
7.2 Returns...........................................................................................................15
List of Figures
Figure 3-1 Resistivity Meter, Model 88C..........................................................................8
Figure 4-1 Resistivity Chart for NaCl Solutions..............................................................11
List of Tables
Table 3-1 Resistivity Meter, Model 88C Specifications....................................................7
Table 3-2 Range of Environmental Conditions ................................................................7
Table 6-1 Model 88 Resistivity Meter Included Parts....................................................14
Table 6-2 Optional Equipment.......................................................................................14
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Model 88C Instruction Manual
1 Introduction
The Model 88C Resistivity Meter measures the resistivity of fluids, slurries, and
semisolids according to API recommended practice. Field and laboratory personnel
rely on this instrument to evaluate formation characteristics from electric logs.
Resistivity is the ability of a material to resist conduction; conductivity is the
reciprocal of resistivity.
1.1 Document Conventions
The following icons are used as necessary in this instruction manual.
NOTE.Notes emphasize additional information that may be
useful to the reader.
CAUTION. Describes a situation or practice that requires operator
awareness or action in order to avoid undesirable consequences.
MANDATORY ACTION. Gives directions that, if not observed,
could result in loss of data or in damage to equipment.
WARNING! Describes an unsafe condition or practice that if not
corrected, could result in personal injury or threat to health.
ELECTRICITY WARNING! Alerts the operator that there is risk of
electric shock.
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Model 88C Instruction Manual
HOT SURFACE! Alerts the operator that there is a hot surface and
that there is risk of getting burned if the surface is touched.
EXPLOSION RISK! Alerts the operator that there is risk of
explosion.
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Model 88C Instruction Manual
2 Safety
Safe laboratory practices and procedures should be observed while operating and
maintaining the Model 88C.
2.1 Battery Safety
On nine volt batteries, the positive and negative terminals are on
the same end, next to each other. If these terminals touch
anything metal, such as steel wool, coins, or a paper clip, a short
circuit could occur, creating heat, sparks, a fire, or an explosion.
Nine volt batteries can explode if they are stored in a hot location,
charged improperly, or if the terminals contact metal, creating a
short circuit.
Some batteries contain toxic or corrosive material, which can leak
if the battery is damaged.
•Store unused 9-volt batteries in their original packaging, a sealed plastic container,
or securely cover both terminals to prevent short circuits.
•Do not charge rechargeable batteries before storing them.
•Store batteries at or below 70oF (21oC).
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Model 88C Instruction Manual
3 Features and Specifications
The Model 88C can measure resistivity in three ranges – 0.01 to 2, 0.1 to 20, and
1.0 to 200 ohm meters. The ohm-meter reading can be converted into parts per
million sodium chloride (or equivalent calcium chloride, potassium chloride or
other carbonate or hydroxyl salts) using the resistivity chart (Figure 4-1). This
instrument can be operated by its own batteries or by a battery eliminator (P/N
101710234).
The Model 88C has these features:
•Direct digital readout in ohm-meters
•Built-in temperature probe
•Low battery indicator
•Test Button for calibration
Table 3-1 Resistivity Meter, Model 88C Specifications
Category Specification
Meter Range 0.01 to 200 ohm-meters
Meter Dimensions
(Height x Width x Length) 2.8 x 5.1 x 8.3 inches
7.1 x 13 x 21 centimeters
Carrying Case Dimensions
(Height x Width x Length) 9 x 3.5 x 7.9 inches
22.9 x 8.9 x 20.1 centimeters
Weight 4 lb (1.8 kg)
Power Supply 4 x 9V alkaline batteries
Table 3-2 Range of Environmental Conditions
Maximum Altitude
6562 ft (2000 m)
Temperature Range
41oF to 104oF (5oC to 40oC)
Maximum Relative Humidity (RH)
80% RH at 87.8oF (31oC) or less
50% RH at 104
o
F (40
o
C)
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Model 88C Instruction Manual
Figure 3-1 Resistivity Meter, Model 88C
Sample Cell
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Model 88C Instruction Manual
4 Operation
The Model 88C Resistivity Meter can measure resistivity of fluid samples and
semisolid samples (e.g., filter cakes or mud solids). Procedures for both types of
samples are listed here.
The resistivity chart or nomograph (Figure 4-1) is used to determine the quantity of
sodium chloride (in combination with distilled water or other salt-free aqueous
medium) that is required to produce a solution with the same resistivity as the
sample. The concentration for carbonate salts, calcium salts, and hydroxyl salts can
be found in conductance tables for aqueous solutions.
4.1 Fluid Samples
This procedure explains how to measure resistivity of liquids, filtrates, and drilling
fluids.
1. Remove the Sample Cell from the Resistivity Meter and fill it with the test
sample. When filling the cell with filtrate, fill and discharge the sample several
times before the final filling.
Make sure there are no bubbles in the sample.
2. Reattach the sample cell onto the pins on the meter.
3. Insert the temperature probe in the wall in the sample cell, set the MODE
switch to TEMP and allow the temperature reading to stabilize. This will take
at least three minutes if meter and sample are not at room temperature.
4. Set the MODE switch to RES, read and record the resistivity in ohmmeters.
5. Remove the sample cell and clean it with distilled water. If necessary, use a
pipe cleaner and mild soap to clean the cell bore.
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Model 88C Instruction Manual
Do not use solvents to clean the cell.
6. Using the nomograph (Figure 4-1), convert the resistivity in ohm-meters to
concentration of chlorides.
4.2 Semisolid Samples
This procedure explains how to measure resistivity of semisolid samples, such as
filter cakes and mud solids.
1. Prepare samples of uniform moisture content.
2. Fill the slot on the outer surface of the cell completely with a semisolid sample.
3. Follow steps 2 through 6 from 4.1 Fluid Samples.
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