Geokon 4430 User manual

Instruction Manual
Model 4430
VW Deformation Meter
No part of this instruction manual may be reproduced, by any means, without the written consent of
Geokon, Inc.
The information contained herein is believed to be accurate and reliable. However, Geokon, Inc. assumes
no responsibility for errors, omissions or misinterpretation. The information herein is subject to change
without notification.
Copyright © 1988-2016. by Geokon, Inc.
(Doc Rev I, 11/10/16)

Warranty Statement
Geokon, Inc. warrants its products to be free of defects in materials and workmanship, under
normal use and service for a period of 13 months from date of purchase. If the unit should
malfunction, it must be returned to the factory for evaluation, freight prepaid. Upon examination
by Geokon, if the unit is found to be defective, it will be repaired or replaced at no charge.
However, the WARRANTY is VOID if the unit shows evidence of having been tampered with or
shows evidence of being damaged as a result of excessive corrosion or current, heat, moisture or
vibration, improper specification, misapplication, misuse or other operating conditions outside of
Geokon's control. Components which wear or which are damaged by misuse are not warranted.
This includes fuses and batteries.
Geokon manufactures scientific instruments whose misuse is potentially dangerous. The
instruments are intended to be installed and used only by qualified personnel. There are no
warranties except as stated herein. There are no other warranties, expressed or implied, including
but not limited to the implied warranties of merchantability and of fitness for a particular purpose.
Geokon, Inc. is not responsible for any damages or losses caused to other equipment, whether
direct, indirect, incidental, special or consequential which the purchaser may experience as a
result of the installation or use of the product. The buyer's sole remedy for any breach of this
agreement by Geokon, Inc. or any breach of any warranty by Geokon, Inc. shall not exceed the
purchase price paid by the purchaser to Geokon, Inc. for the unit or units, or equipment directly
affected by such breach. Under no circumstances will Geokon reimburse the claimant for loss
incurred in removing and/or reinstalling equipment.
Every precaution for accuracy has been taken in the preparation of manuals and/or software,
however, Geokon, Inc. neither assumes responsibility for any omissions or errors that may appear
nor assumes liability for any damages or losses that result from the use of the products in
accordance with the information contained in the manual or software.

CONTENTS
Page
1. INTRODUCTION...........................................................................................................................................1
1.1. THEORY OF OPERATION...............................................................................................................................1
2. INSTALLATION.............................................................................................................................................2
2.1. PRELIMINARY TESTS...................................................................................................................................2
2.2. DEFORMATION METER INSTALLATION ........................................................................................................2
2.2.1. Installation in Boreholes.................................................................................................................2
2.2.2. Installation in Mass Concrete........................................................................................................3
2.2.3. Installation in Fills and Embankments – Soil Strain Gages......................................................3
2.3. CABLE PROTECTION AND TERMINATION .....................................................................................................4
2.4. INITIAL READINGS ......................................................................................................................................4
2.5. ELECTRICAL NOISE......................................................................................................................................4
3. TAKING READINGS.....................................................................................................................................6
3.1. OPERATION OF THE GK-403 READOUT BOX...............................................................................................6
3.2 OPERATION OF THE GK404 READOUT BOX.................................................................................................6
3.3 OPERATION OF THE GK405 READOUT BOX.................................................................................................7
3.4. MEASURING TEMPERATURES......................................................................................................................8
4. DATA REDUCTION......................................................................................................................................9
4.1. DEFORMATION CALCULATION....................................................................................................................9
4.2. TEMPERATURE CORRECTION ....................................................................................................................10
4.3. ENVIRONMENTAL FACTORS......................................................................................................................11
5. TROUBLESHOOTING................................................................................................................................13
APPENDIX A - SPECIFICATIONS...............................................................................................................14
A.1. MODEL 4430 DEFORMATION METER........................................................................................................14
APPENDIX B - THERMISTOR TEMPERATURE DERIVATION............................................................15

LIST of FIGURES, TABLES and EQUATIONS
Page
FIGURE 1-MODEL 4430 DEFORMATION METER ................................................................................................. 1
FIGURE 2-BOREHOLE INSTALLATION................................................................................................................... 2
FIGURE 3-INSTALLATION ALONG CREST OF DAM............................................................................................... 3
FIGURE 4-BOREHOLE INSTALLATION IN EMBANKMENT....................................................................................... 4
FIGURE 5-LIGHTNING PROTECTION SCHEME ..................................................................................................... 5
FIGURE 6GK405 READOUT UNIT......................................................................................................................... 7
EQUATION 1-DIGITS CALCULATION..................................................................................................................... 9
EQUATION 2-DEFORMATION CALCULATION ........................................................................................................ 9
TABLE 1-ENGINEERING UNITS CONVERSION MULTIPLIERS ............................................................................... 9
EQUATION 3-THERMALLY CORRECTED DEFORMATION CALCULATION ............................................................ 10
EQUATION 4-THERMAL COEFFICIENT CALCULATION........................................................................................ 10
TABLE 2-THERMAL COEFFICIENT CALCULATION CONSTANTS ......................................................................... 10
EQUATION 5-GAGE LENGTH CORRECTION....................................................................................................... 10
FIGURE 7ATYPICAL CALIBRATION SHEET ......................................................................................................... 12
TABLE A-1 MODEL 4430 SPECIFICATIONS......................................................................................................... 14
EQUATION B-1 CONVERT THERMISTOR RESISTANCE TO TEMPERATURE ........................................................ 15
TABLE B-1 THERMISTOR RESISTANCE VERSUS TEMPERATURE ....................................................................... 15

1. INTRODUCTION
1.1. Theory of Operation
The Geokon Model 4430 Vibrating Wire Deformation Meter is designed to measure axial
deformations in boreholes in rock, concrete or soil. It can also be embedded in soils in
embankments such as earth dams and highway fills. The units can be installed in series
providing incremental deformation measurements over any length. Base lengths of the
gage can vary from a minimum of 1 meter to over 25 meters.
The basic sensing element is a vibrating wire strain gage in series with a precision music
wire spring which is coupled to a movable shaft. As the shaft moves in or out of the sensor
body, the tension in the spring, and also in the vibrating wire element, change. This change
in tension is directly proportional to the amount of extension and, through calibration, a
calibration factor that relates the frequency of vibration to the amount of extension is
determined. The unit is stress relieved after manufacture providing for excellent stability
over long periods of time.
The gage sensor is attached to a flange at one end and by a connecting rod of some length
to a flange at the other end. The sensor and the rod are covered by a plastic (PVC) tube
which holds the end flanges apart at a predetermined distance (gage length), and insures
that the rod is free to move. As the flanges move apart the movement is conveyed by the
connecting rod to the sensor and measured by the readout system. Different combinations
of gage length and sensor range provide for optimum sensitivity. For maximum strain
resolution, a long base gage with a short range transducer will give best results. For
maximum deformation: short base length, longer transducer range. The flexibility of the
system allows the user to choose the most useful combination of range and sensitivity
according to predicted movements.
Nominal Gage Length
(1m, 39")
End Flange
Swagelok Fitting
Instrument Cable
End Flange
Electromagnetic Coils Thermistor (4 conductor, 22 AWG)
PVC Outer Tube
Transducer Shaft HousingAlignment Pin
Alignment Slot
Extension Rod Transducer Shaf
t
Figure 1 - Model 4430 Deformation Meter
Readouts available from Geokon, used in conjunction with the Vibrating Wire Deformation
Meter, will provide the necessary voltage pulses to pluck the wire and convert the measured
frequencies so as to display the reading.

2
2. INSTALLATION
2.1. Preliminary Tests
Upon receipt of the instrument, the gage should be checked for proper operation (including
the thermistor). See Section 3 for readout instructions. In position "B" the gage will read
between 2000 and 8000 digits. Pull slightly on the end flanges (Figure 1), the reading
should increase.
Checks of electrical continuity can also be made using an ohmmeter. Resistance between
the gage leads should be approximately 180, ±10. Remember to add cable resistance
when checking (22 AWG stranded copper leads are approximately 14.7/1000' or 48.5
/km, multiply by 2 for both directions). Between the green and white should be
approximately 3000 ohms at 25° (see Table B-1), and between any conductor and the shield
should exceed 2 megohms.
2.2. Deformation Meter Installation
2.2.1. Installation in Boreholes
The primary use of the Model 4430 is for the measurement of axial strains or deformations
in boreholes. The most common method of installation is by grouting. Horizontal holes
should be inclined slightly downward to make for easy grouting and to avoid air pockets.
Vertical up holes require special grouting apparatus and snap-ring or hydraulic anchors on
the gage itself to hold it in place while grouting the hole. Horizontal and vertical down holes
are instrumented as follows:
Drill the borehole at least 0.5 m (2 ft) beyond the location of the deepest flange. The
borehole must be a minimum of 60 mm (2.25") in diameter. Fill the hole with grout mixture
of 1 part Portland cement to 1-2 parts water by volume. An expansive mix is helpful
particularly in horizontal holes. Lower or push the sensor(s) down the hole to the proper
location as noted by a mark on the cable. If more than one sensor is to be placed in a hole,
be sure to maintain the position of the lower sensor while installing shallower ones.
Grout
Instrument Cable
Deformation Meter Fault
Borehole
Figure 2 - Borehole Installation

3
For situations such as soft ground or when the hole is cased and casing must be withdrawn,
it may be advisable to use a sensor with a hydraulic anchor for permanent positioning. This
should be discussed with the application engineers at the factory.
2.2.2. Installation in Mass Concrete
The Model 4430 can be placed directly into concrete or prewired into the rebar cage or
network prior to concrete placement. Tiewires should be connected to the tube rather than
the end blocks and should be perpendicular to the tube and not excessively tight to allow for
shifting during placement of the concrete. The unit has a compressive modulus of
approximately 200,000 psi, and should follow the concrete at very early stages of curing.
2.2.3. Installation in Fills and Embankments – Soil Strain Gages
( For more details see the Model 4435 Soil Strainmeter Manual)
The Model 4435, which is a variation of the Model 4430, is used as a soil deformation meter
in fills and embankments by placing the unit in shallow, horizontal trenches in the fill.
Multiple sensors can be installed in series to give a total deformation profile along a
particular axis as in a dam or highway embankment. Cables issue out of the side of the
devise so that the flanges can be linked together easily.
Downstream
Deformation Meters
Reservoir
Figure 3 - Installation Along Crest of Dam
A narrow flat bottom trench should be excavated in previously compacted fill. The sensor is
laid in the trench and backfilled with material which has had any large (>10 mm, 0.5")
aggregate removed. Backfill and hand tamp the first 15 cm (6") and then proceed with the
compaction of the fill in the normal way. Cables should also be run in trenches and
backfilled in the same manner as above. For more details consult the Model 4435 Soil
Strainmeter manual.

4
E
m
b
an
k
ment
F
ace
Shear Zone
Horizontal Borehole
Deformation Meters
Figure 4 - Borehole Installation in Embankment
2.3. Cable Protection and Termination
As noted above, the cable from the gages can be protected by the use of flexible conduit,
which can be supplied by Geokon.
Terminal boxes with sealed cable entries and covers are also available, allowing many
gages to be terminated at one location with complete protection of the lead wires. The
panel can have built-in jacks or a single connection with a rotary position selector switch.
Lightning protection components can also be installed in the terminal boxes.
Cables may be spliced to lengthen them, without affecting gage readings. Always
waterproof the splice completely, preferably using an epoxy based splice kit such the 3M
Scotchcast, model 82-A1. These kits are available from the factory. When making
splices, use solder connections wherever feasible or crimp connectors if not.
2.4. Initial Readings
All readings are referred to an initial reading so it is important that this initial reading
be carefully taken. Conditions should be noted at the time of all readings, especially during
curing, i.e., temperature, time after placement, local conditions, etc.
2.5. Electrical Noise
Care should be exercised when installing instrument cables to keep them as far away as
possible from sources of electrical interference such as power lines, generators, motors,
transformers, arc welders, etc. Cables should never be buried or run with AC power
lines! The instrument cables will pick up the 50 or 60 Hz (or other frequency) noise from the
power cable and this will likely cause a problem obtaining a stable reading.

5
2.6. Lightning Protection
The Model 4430 Vibrating Wire Deformation Meter, unlike numerous other types of
instrumentation available from Geokon, do not have any integral lightning protection
components, i.e. transzorbs or plasma surge arrestors. Usually this is not a problem
however, if the instrument cable is exposed, it may be appropriate to install lightning
protection components, as the transient could travel down the cable to the deformation
meter and possibly destroy it.
Note the following suggestions;
If the gage is connected to a terminal box or multiplexer components such as plasma
surge arrestors (spark gaps) may be installed in the terminal box/multiplexer to provide a
measure of transient protection. Terminal boxes and multiplexers available from
Geokon provide locations for installation of these components.
Lighting arrestor boards and enclosures are available from Geokon that install near the
instrument. The enclosure has a removable top so, in the event the protection board
(LAB-3) is damaged, the user may service the components (or replace the board). A
connection is made between this enclosure and earth ground to facilitate the passing of
transients away from the gage. See Figure 5. Consult the factory for additional
information on these or alternate lightning protection schemes.
Plasma surge arrestors can be epoxy potted into the gage cable close to the sensor. A
ground strap would connect the surge arrestor to earth ground; either a grounding stake
or other suitable earth ground.
Terminal Box
/
Multiplexer
Instrument Cable LAB-3 Enclosure LAB-3 Board
Deformation Meter
Ground Connections
Surface
(usually buried)
Figure 5 - Lightning Protection Scheme

6
3. TAKING READINGS
3.1. Operation of the GK-403 Readout Box
The GK-403 can store gage readings and also apply calibration factors to convert readings
to engineering units. Consult the GK-403 Instruction Manual for additional information on
Mode "G" of the Readout. The following instructions will explain taking gage measurements
using Mode "B".
Connect the Readout using the flying leads or in the case of a terminal station, with a
connector. The red and black clips are for the vibrating wire gage, the white and green clips
are for the thermistor and the blue for the shield drain wire.
1. Turn on the Readout. Turn the display selector to position "B". Readout is in digits (see
Equation 1).
2. Turn the unit on and a reading will appear in the front display window. The last digit may
change one or two digits while reading. Press the "Store" button to record the value
displayed. If the no reading displays or the reading is unstable see section 6 for
troubleshooting suggestions. The thermistor will be read and output directly in degrees
centigrade.
3. The unit will automatically turn itself off after approximately 2 minutes to conserve power.
3.2 Operation of the GK404 Readout Box
The GK404 is a palm sized readout box which displays the Vibrating wire value and the
temperature in degrees centigrade.
The GK-404 Vibrating Wire Readout arrives with a patch cord for connecting to the vibrating
wire gages. One end will consist of a 5-pin plug for connecting to the respective socket on
the bottom of the GK-404 enclosure. The other end will consist of 5 leads terminated with
alligator clips. Note the colors of the alligator clips are red, black, green, white and blue.
The colors represent the positive vibrating wire gage lead (red), negative vibrating wire gage
lead (black), positive thermistor lead (green), negative thermistor lead (white) and
transducer cable drain wire (blue). The clips should be connected to their respectively
colored leads from the vibrating wire gage cable.
Use the POS (Position) button to select position Band the MODE button to select Dg
(digits).
Other functions can be selected as described in the GK404 Manual.
The GK-404 will continue to take measurements and display the readings until the OFF
button is pushed, or if enabled, when the automatic Power-Off timer shuts the GK-404 off.
The GK-404 continuously monitors the status of the (2) 1.5V AA cells, and when their
combined voltage drops to 2V, the message Batteries Low is displayed on the screen. A
fresh set of 1.5V AA batteries should be installed at this point

7
3.3 Operation of the GK405 Readout Box
The GK-405 Vibrating Wire Readout is made up of two components:
The Readout Unit, consisting of a Windows Mobile handheld PC running the GK-405
Vibrating Wire Readout Application
The GK-405 Remote Module which is housed in a weather-proof enclosure and
connects to the vibrating wire sensor by means of:
1) Flying leads with alligator type clips when the sensor cable terminates in bare wires or,
2) By means of a 10 pin connector..
The two components communicate wirelessly using Bluetooth®, a reliable digital
communications protocol. The Readout Unit can operate from the cradle of the Remote
Module (see Figure 6) or, if more convenient, can be removed and operated up to 20 meters
from the Remote Module
Figure 6 GK405 Readout Unit
For further details consult the GK405 Instruction Manual.

8
3.4. Measuring Temperatures
Each Vibrating Wire Deformation Meter is equipped with a thermistor for reading
temperature. The thermistor gives a varying resistance output as the temperature changes.
Usually the white and green leads are connected to the internal thermistor.
1. Connect the ohmmeter to the two thermistor leads coming from the deformation meter.
(Since the resistance changes with temperature are so large, the effect of cable
resistance is usually insignificant.)
2. Look up the temperature for the measured resistance in Table B-1 (Appendix B).
Alternately the temperature could be calculated using Equation B-1 (Appendix B). For
example, a resistance of 3400 ohms equivalent to 22° C. When long cables are used
the cable resistance may need to be taken into account. Standard 22 AWG stranded
copper lead cable is approximately 14.7/1000' or 48.5/km, multiply by 2 for both
directions.
Note: All readout boxes will read the thermistor and display temperature in C automatically.

9
4. DATA REDUCTION
4.1. Deformation Calculation
The basic units utilized by Geokon for measurement and reduction of data from Vibrating
Wire Deformation Meters are "digits". The units displayed by all Readout Boxes in position
"B" are digits. Calculation of digits is based on the following equation;
Digits Period 




23
110 or Digits Hz

2
1000
Equation 1 - Digits Calculation
To convert digits to deformation the following equation applies;
Deformation (Current Reading - Initial Reading) Calibration Factor Conversion
Factor
or
D = (R1- R0) G F
Equation 2 - Deformation Calculation
Where; R1is the Current Reading.
R
0is the Initial Reading usually obtained at installation (see section 2.4).
G is the Calibration Factor, usually in terms of millimeters or inches per digit.
F is an engineering units conversion factor (optional), see Table 1.
From
To
Inches Feet Millimeters Centimeter
s
Meters
Inches 1 12 0.03937 0.3937 39.37
Feet 0.0833 1 0.003281 0.03281 3.281
Millimeters 25.4 304.8 1 10 1000
Centimeters 2.54 30.48 0.10 1 100
Meters 0.0254 0.3048 0.001 0.01 1
Table 1 - Engineering Units Conversion Multipliers
For example, taken from the typical Calibration Sheet shown in Figure 7 the Initial Reading
(R0) at installation of a deformation meter with a 25 mm transducer range is 4250 digits.
The Current Reading (R1) is 6785. The Calibration Factor is 0.004457 mm/digit. The
deformation change is;
D = (6785 4250) 0.004457 = +11.4 mm
Note that increasing readings (digits) indicate increasing extension.

10
4.2. Temperature Correction
The Model 4430 Deformation Meter has a very small coefficient of thermal expansion so in
most cases correction is not necessary. However, if maximum accuracy is desired or the
temperature changes are extreme (>10° C) corrections may be applied. The following
equation applies;
Dcorrected = ((R1- R0) G) + ((T1- T0) K) + LC
Equation 3 - Thermally Corrected Deformation Calculation
Where; R1is the Current Reading.
R
0is the Initial Reading.
G is the Calibration Factor.
T
1is the Current Temperature.
T
0is the Initial Temperature.
K is the Thermal Coefficient.
L
Cis the correction for the gage length.
Tests have determined that the Thermal Coefficient, K, changes with the position of the
transducer shaft. Hence, the first step in the temperature correction process is
determination of the proper Thermal Coefficient based on the following equation;
Thermal Coefficient = ((Reading in Digits Multiplier) Constant) Calibration Factor
or
K = ((R1M) B) C
Equation 4 - Thermal Coefficient Calculation
See Table 2 for the Multiplier and Constant values used in Equation 4. The Multiplier (M)
and Constant (B) values vary for the stroke of the transducer used in the Deformation Meter.
Model: 4430-3
mm
4430-
0.125”
4430-12
mm
4430-
0.5"
4430-25
mm
4430-1"
4430-50
mm
4430-2"
4430-
100mm
4430-4”
4430-
150mm
4430-6”
4430-
300mm
4430-12”
Multiplier
(M): 0.000520 0.000375 0.000369 0.000376 0.000398 0.000384 0.000424 *
Constant
(B): 3.567 1.08 0.572 0.328 0.0864 -0.3482 -0.6778*
Transducer
Length (L): 267mm 10.5” 267 mm 10.5" 267 mm 10.5" 292 mm 11.5" 393mm 15.49” 510.5mm 20.1” 715.2mm 28.2”
* Calculated Table 2 - Thermal Coefficient Calculation Constants
The gage length correction (LC) is calculated using Equation 5.
LC= 17.3 10-6 L (T1- T0)
Equation 5 - Gage Length Correction
Where L is the length of deformation meter in millimeters or inches, minus the transducer
length (see Table 2) in millimeters or inches, respectively.

11
Consider the following example using a Model 4430 Deformation Meter with a 1 meter gage
length and 25 mm transducer. Taken from the calibration sheet shown in Figure 7
R0= 4250 digits
R1= 6785 digits
T0= 10° C
T1= 20° C
G = 0.004457 mm/digit
K = ((6785
 0.000369) + 0.572)  0.004457 = 0.0137
L = 1000 - 267 = 733
LC= 17.3
 10-6  733  (20 - 10) = 0.1268
Dcorrected = ((R1- R0)
 G) + ((T1- T0)  K) + LC
Dcorrected = ((6785 - 4250)
 0.004457) + ((20 - 10)  0.0137) + 0.1268
Dcorrected = (2535
 0.004457) + (10  0.0137) + 0.1268
Dcorrected = 11.298 + 0.137 + 0.1268
Dcorrected = +11.56 mm
As can be seen from the above example, the corrections for temperature change are small
and can often be ignored.
4.3. Environmental Factors
Since the purpose of the Deformation Meter installation is to monitor site conditions, factors
which may affect these conditions should always be observed and recorded. Seemingly
minor effects may have a real influence on the behavior of the structure being monitored
and may give an early indication of potential problems. Some of these factors include, but
are not limited to: blasting, rainfall, tidal levels, excavation and fill levels and sequences,
traffic, temperature and barometric changes, changes in personnel, nearby construction
activities, seasonal changes, etc.

12
Figure 7 A Typical Calibration Sheet

13
5. TROUBLESHOOTING
Maintenance and troubleshooting of Vibrating Wire Deformation Meters is confined to
periodic checks of cable connections. Once installed, the cells are usually inaccessible and
remedial action is limited. Consult the following list of problems and possible solutions
should difficulties arise. Consult the factory for additional troubleshooting help.
Symptom: Deformation Meter Readings are Unstable
Is the readout box position set correctly? If using a datalogger to record readings
automatically are the swept frequency excitation settings correct? Try reading the
deformation meter on a different readout position. For instance, channel A of the
Readout Boxes might be able to read the deformation meter. To convert the Channel A
period display to digits use Equation 1.
Is there a source of electrical noise nearby? Most probable sources of electrical noise
are motors, generators, transformers, arc welders and antennas. Make sure the shield
drain wire is connected to ground whether using a portable readout or datalogger. If
using the GK-401 Readout connect the clip with the green boot to the bare shield drain
wire of the pressure cell cable. If using the GK-403, GK-404 or GK405 connect the clip
with the blue boot to the shield drain wire.
Does the readout work with another deformation meter? If not, the readout may have a
low battery or be malfunctioning. Consult the appropriate readout manual for charging
or troubleshooting directions.
Symptom: Deformation Meter Fails to Read
Is the cable cut or crushed? This can be checked with an ohmmeter. Nominal
resistance between the two gage leads (usually red and black leads) is 180, 10.
Remember to add cable resistance when checking (22 AWG stranded copper leads are
approximately 14.7/1000' or 48.5/km, multiply by 2 for both directions). If the
resistance reads infinite, or very high (megohms), a cut wire must be suspected. If the
resistance reads very low (100) a short in the cable is likely.
Does the readout or datalogger work with another deformation meter? If not, the
readout or datalogger may be malfunctioning. Consult the readout or datalogger manual
for further direction.

14
APPENDIX A - SPECIFICATIONS
A.1. Model 4430 Deformation Meter
Gage Length:11 meter (40 inches)
Ranges Available:112, 25, 50 mm
0.5, 1, 2"
Overrange: 115%
Accuracy: 0.1% (with polynomial expression)
Resolution: 0.025% FSR
Linearity: 0.25% FSR
Thermal Zero Shift: < 0.05% FSR/°C
Stability: < 0.2%/yr (under static conditions)
Temperature Range: -40 to +60°C
-40 to 120° F
Frequency Range: 1200 - 2800 Hz
Coil Resistance: 180 , 10 
Cable Type:22 twisted pair (4 conductor) 22 AWG
Foil shield, PVC jacket, nominal OD=6.3 mm (0.250")
Length:
(end to end) 1 meter, 40 inches
Diameter: 26.7 mm, 1.050" (body)
51 mm, 2" (flange)
Weight:
1 kg., 2.2 lbs.
Table A-1 Model 4430 Specifications
Notes:
1Consult the factory for other lengths and ranges available.
2Consult the factory for alternate cable types.
A.2 Thermistor (see Appendix B also)
Range: -80 to +150° C
Accuracy: ±0.5° C