JEWELL DeepWater 802 User manual

USER’S MANUAL
DeepWater
MODEL 802 SUBMERSIBLE
TILTMETER
Serial No.________________
850 Perimeter Road
Manchester, NH 03103 USA
Tel [phone]
Fax [phone]
e-mail: [e-mail]
www.jewellinstruments.com
WARNING!
NEVER USE AN OHMMETER TO MEASURE THE TILT SENSORS INSIDE THE TILTMETER. APPLYING
DC CURRENT THROUGH THE SENSORS WILL CAUSE PERMANENT DAMAGE THAT IS NOT
COVERED BY THE WARRANTY.
Copyright ©2013 by Jewell Instruments LLC. All rights reserved.
Manual No. B-03-1004, Rev. F. Printed in USA.

TABLE OF CONTENTS
1. Introduction ................................................................................................................ 1
2. Technical Features..................................................................................................... 1
3. Specifications............................................................................................................. 2
4. Tiltmeter Operations .................................................................................................. 3
4.1 Initial Check-Out Procedures.................................................................................. 3
4.2 Tiltmeter Installation................................................................................................ 3
4.3 Recording Tiltmeter Data with External Recorders ................................................. 3
5. Converting Voltage Readings to Tilt Angles and Temperatures............................ 4
6. Grounding and Transient Protection........................................................................ 4
7. Maintenance and Troubleshooting........................................................................... 4
7.1 Routine Maintenance.............................................................................................. 4
7.2 Connector Maintenance.......................................................................................... 5
7.3 Determining the Cause of Malfunctions .................................................................. 5
8. Warranty and Assistance........................................................................................... 6
Appendix A. Custom Specifications for Your Equipment;......................................... 12
A.1 Scale Factors........................................................................................................ 12
A.2 Filter...................................................................................................................... 13
A.3 Connectors and Cables......................................................................................... 13
A.4 Angle Conversion Chart........................................................................................ 14
Appendix B. Revision Record....................................................................................... 15
LIST OF FIGURES
Figure 1. Model 802 DeepWater Tiltmeter........................................................................................................................7
Figure 2. Model 802 DeepWater Tiltmeter with Connector and Cable Whip ...................................................................7
Figure 3. High-Pressure Connector and Cable Whip..........................................................................................................8
Figure 4. Tiltmeter with Biaxial Tilt Configuration ...........................................................................................................8
Figure 5. Tiltmeter with Logitudinal Tilt Configuration ....................................................................................................9
Figure 6. Tiltmeter with Transverse Tilt Configuration .....................................................................................................9
Figure 7. Model 802 DeepWater Dimensions in Inches (mm)........................................................................................10
Figure 8. Model 802 DeepWater Mounting Hole Pattern................................................................................................10
Figure 9. Sensor Connections Inside the Model 802 DeepWater Tiltmeter.....................................................................11
Figure 10. Face View of 6-pin Male Connector on Tiltmeter ..........................................................................................13
Figure 11. Face View of 8-pin Male Connector on Tiltmeter ............................................................................................14

B-03-1004, Rev. F –Model 802 DeepWater Submersible Tiltmeter
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1. Introduction
The Model 802 DeepWater is a precision tiltmeter designed for underwater tilt measurements
and other applications involving high external pressures (Figure 1). Model 802 offers unrivaled
sensitivity and long-term stability under these demanding conditions. The 316 stainless steel housing
encloses stable, low-noise electronics and an electrolytic tilt sensor, which is the internal sensing element.
Measured angular movement is referenced to the unchanging vertical gravity vector, eliminating the time
and expense of locating an external datum. DeepWater tiltmeters are an excellent choice for monitoring
the behavior of underwater structures, such as dams, oil platforms and pipelines; measuring the rotational
movement of underwater machinery; and tracking the pitch and roll of marine vessels.
2. Technical Features
Your Model 802 DeepWater is the newest addition to Jewell Instruments' line of 800-Series
tiltmeters, which was first introduced in 1989. Model 802 senses angular movement (rotation) with
respect to the vertical gravity vector. The sensing element is an electrolytic tilt transducer, similar to a
spirit level. As the transducer tilts, internal electrodes are covered or uncovered by a conductive fluid.
This process produces changes in electrical resistance when an AC excitation is passed through the
transducer. These changes are measured using a voltage divider network. The resulting signal is then
amplified, actively rectified and filtered to form a high-level DC signal that is proportional to the
measured angular rotation, or tilt. Both single-ended and differential tilt outputs are provided.
High-reliability components and surge protection enhance tiltmeter performance under
electrically noisy or transient-prone conditions. A 2-pole Butterworth low-pass filter removes vibration
effects for static measurements. In addition, your tiltmeter contains a built-in temperature sensor with
single-ended analog voltage output. This temperature sensor provides the data that can be used for
analysis of thermal deformation and stresses.
Your tiltmeter is equipped with either a 6, or 8-pin male Subconn MicroCircular bulkhead
connector for external power and signal connections (Figure 1). This neoprene connector has a depth
rating of 700 bars (10,000 psi). The tiltmeter comes with a mating female connector and cable whip
(Figure 2). The required cable length is specified when ordering. The pressure rating of the tiltmeter
housing is 250 bars (3600 psi).
Model 802 DeepWater tiltmeters are produced in high-gain (±0.5range), standard (±3range)
and wide-angle (±50range) versions. Each version is available in longitudinal, transverse, and biaxial
tilt configurations to better meet your installation requirements (Figures 3, 4, & 5). The version that you
have selected is indicated at the beginning of Appendix A.
Other important features include the following:
All electronics reside on a single internal printed-circuit board.
All circuit board external connections are gold-plated for long life and noise-free operation.
All resistors are premium quality, 1% tolerance, metal-film type.
All tiltmeters are assembled, calibrated and tested at our plant under strict quality standards.
Jewell Instruments maintains complete calibration and test records of every tiltmeter built.

B-03-1004, Rev. F –Model 802 DeepWater Submersible Tiltmeter
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3. Specifications
Model 802-H
High-Gain Version
Model 802-S
Standard Version
Model 802-W
Wide-Angle Version
ANGULAR RANGE
±0.5 degrees
±3 degrees
±50 degrees*
SCALE FACTORS
0.1/ Volt (single-ended)
0.05/ Volt (differential)
0.6/ Volt (single-ended)
0.3/ Volt (differential)
10/ Volt (single-ended)
5/ Volt (differential)
RESOLUTION
<0.0001 degree (<1.75 radians)
<0.0006 degree (10.5 radians)
<0.01 degree
REPEATABILITY
<0.0002 degree
0.001 degree
0.02 degree
LINEARITY
1% of full span typical
<2% of full span typical
0.5% of full span typical
TEMPERATURE
COEFFICIENT
Scale factor: KS< 0.02%/oC typ.
Zero shift: KZ= ±0.0002 degree/oC
KS< 0.02%/oC typ.
KZ= ±0.0002 degree/oC typ.
KS< 0.02%/oC typ.
KZ= ±0.002 degree/oC typ.
TIME CONSTANT, T
1.75 seconds (2-pole Butterworth low-pass filter), faster response
available
0.175 second
TILT OUTPUT
5 VDC single-ended, 10 VDC differential (both provided)
TEMPERATURE OUTPUT
0.1°C/mV (single-ended), 40° to +100°C, ±0.75°C accuracy, 0°C = 0 mV
OUTPUT IMPEDANCE
270 Ohms, short circuit and surge protected
POWER REQ’TS.
+9 to +35 VDC @ 8 mA, 250 mV peak-to-peak ripple max., reverse polarity protected
ENVIRONMENTAL
25to +70C operating, 30to +100C storage; submersible to 250 bars (3,600 psi)
ENCLOSURE &
MOUNTING
316 stainless steel enclosure, machined from single block, 149 x 91 x 82 mm (5.85 x 3.56 x 3.20 inches).
Four 5.1 mm(0.201 inch) dia. external mounting holes
SEALS
Nitrile (Buna-N) face seal O-rings in lid and bulkhead connector
CONNECTORS
6 or 8-pin male bulkhead connector, neoprene over brass body; neoprene in-line connector.
700 bars (10,000 psi) depth rating
CABLE
6 or 8 conductors: Either neoprene cable, 20 AWG, no shield or PVC- jacketed, polypropylene-insulated
cable, 24 AWG, one overall shield. 2 ft (60 cm) neoprene whip is standard, longer cables on request.
WEIGHT
5 kg (11 lb)
* Greater range available

B-03-1004, Rev. F –Model 802 DeepWater Submersible Tiltmeter
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4. Tiltmeter Operation
4.1 Initial Check-Out Procedures
Before installing your tiltmeter, verify that it is functioning properly by following the steps
below:
1. Connect the red and black tiltmeter power wires to a suitable power supply (see
Specifications) and the output wires to a voltmeter (refer to the pin assignments and wire
colors in Appendix A). Or, connect the tiltmeter to a Model 870 Readout Module and
voltmeter.
2. If using the Model 870 Readout Module, turn the Readout Module switch to TILT.
3. Refer to the (+) and () tilt directions in Figures 3 or 4 (also shown on a label on your tilt-
meter). With the tiltmeter in your hands, rotate it to verify the sign (polarity) of the outputs.
A rotation in the (+) direction should make the voltage output become more positive. A ()
rotation should make it become more negative.
4. Check that the tiltmeter output moves through its full range of approximately +5 Volts to -5
Volts (single-ended) or +10 Volts to -10 Volts (differential). When using the Model 870
Readout Module, the output that is displayed on the voltmeter is single-ended. Note that the
positive output is typically greater than +5 Volts (single-ended) or +10 Volts (differential).
5. Next, connect the voltmeter to the temperature output and signal ground (see Appendix A), or
turn the Readout Module switch to TEMPERATURE. Verify that the temperature sensor
output approximates the temperature in your location. For example, a room temperature of
20C (68F) should give a voltage output of 200 mV (0.200 volts). The temperature sensor
scale factor is 0.1C/mV.
If your results do not conform to these guidelines, check your procedure and repeat the measurement
sequence above. If you are still unable to successfully complete the check-out procedure, contact Jewell
Instruments for assistance.
4.2 Tiltmeter Installation
Your Model 802
DeepWater tiltmeter is designed to be mounted directly onto a solid horizontal
surface using four No. 10 or M4 screws. External holes in the submersible stainless steel case are
provided for mounting the tiltmeter (Figures 5 and 6). The surface may be drilled and tapped to accept
the screws, or through-holes may be drilled and the screws attached with nuts and washers on the
underside of the surface.
4.3 Recording Tiltmeter Data with External Recorders
The analog output of your Model 802
DeepWater tiltmeter is readily measured by a variety of
external devices, including digital voltmeters, oscilloscopes, strip-chart recorders, data-loggers, and PC-
based data acquisition systems. Just connect your tiltmeter cable to a suitable external power supply and
to the inputs of your recording device. Refer to the cable color coding table in Appendix A for the
information you will need to make these connections.

B-03-1004, Rev. F –Model 802 DeepWater Submersible Tiltmeter
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5. Converting Voltage Readings to Tilt Angles and Temperatures
The tiltmeter voltage outputs are quickly converted to tilt angles as follows: Multiply the voltage
reading by the scale factor in Appendix A. For example, if the scale factor is 0.600 degree/Volt and the
voltage reading is +2.000 Volts, then the tilt angle is +1.200 degrees from sensor null.
Similarly, the voltage reading from the tiltmeter temperature sensor is converted to temperature
by multiplying it by a scale factor of 0.1C/mV (100C/Volt), with 0 mV = 0C.
6. Grounding and Transient Protection
Your tiltmeter has separate power ground and signal ground wires in the tiltmeter cable. Both are
connected (common) inside the tiltmeter. Signal Ground is the reference state for single-ended tilt
measurements and for temperature measurements. We recommend that you do not connect the Power
Ground and Signal Ground wires at your power supply or recorder. Current needed to power the
tiltmeter flows in the power ground wire and, as predicted by Ohm’s Law, the ground potential is
different at opposite ends of this wire because of wire resistance. By keeping signal ground separate from
power ground, your tilt and temperature readings will not be affected by this potential difference.
If you ground the power ground wire to earth, do so at one end only. Earthing in more than one
location can produce ground loops and create unstable readings.
Variable resistance type surge absorbers connect each wire in the tiltmeter cable to the metal en-
closure (case) that houses your tiltmeter. If operated in salt water, the tiltmeter case will be well
grounded. If operated on land, connecting the enclosure to a grounding rod, or other form of earth
ground, will reduce the likelihood of an electronic failure caused by high-voltage transients. Such
transients can be caused by nearby lightning strikes or unstable power sources. Grounding the cable
shield (PVC jacketed cables only) to earth at the power supply end can also help avoid transient-induced
damage and can reduce noise in your measurements. Note that the cable shield is terminated at the
tiltmeter end and is not connected to the metal tiltmeter enclosure.
High-voltage transients are the most common cause of failure of field instruments in outdoor in-
stallations. In a typical occurrence, a high-voltage spike from a lightning strike or power surge travels
along the cable until it encounters the instrument’s electronic circuitry, where the delicate low-voltage
components are overloaded and fail. The protections provided in your tiltmeter reduce the likelihood of
failure. Commercially available surge suppression circuitry can provide additional protection.
7. Maintenance and Troubleshooting
7.1 Routine Maintenance
The routine maintenance procedures given here will help ensure that your
DeepWater tiltmeter
provides many years of trouble-free service.
Keep your tiltmeter clean and away from extremes of heat and cold. Dirt and extreme tempera-
tures shorten the life of the seals and unnecessarily stress the electronic components. Keep the tiltmeter
out of direct summer sun because solar radiation can create internal temperatures much higher than the
ambient temperature –in some cases higher than the rated storage temperature of the tiltmeter.
To ensure that your tiltmeter maintains its waterproof seal, make sure that the connector and the
screws securing the lid are tight before submergence. The O-ring in the lid is made of nitrile (Buna-N)
and can be replaced if damaged by Parker O-ring size 2-247. The O-ring should be lubricated with a light
coating of silicon grease such as Dow Corning 112 or Molykote 44 Medium.

B-03-1004, Rev. F –Model 802 DeepWater Submersible Tiltmeter
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The electrolytic tilt sensor in your tiltmeter is a stable, robust and shock tolerant device. One of
the few things that can damage it is Direct Current (DC), which causes electrolysis and plating of the
electrodes. Figure 7 shows the sensor connections to the circuit board. NEVER use an ohmmeter (which
uses DC) at these locations.
WARNING!
NEVER USE AN OHMMETER TO MEASURE THE TILT SENSORS INSIDE THE TILTMETER.
APPLYING DC CURRENT THROUGH THE SENSORS WILL CAUSE PERMANENT DAMAGE THAT
IS NOT COVERED BY THE WARRANTY.
7.2 Connector Maintenance
The following handling procedures should be adopted to achieve the best performance from your tiltme-
ter’s high-pressure connectors (courtesy of Subconn Inc.):
•Do not expose the connectors to long-term heat or sunshine. If this occurs, and the connectors are
very dry, soak in fresh water before use.
•Keep the connectors lubricated. The recommended lubricant is Molykote 44 Medium. Use sparingly
–half a match head per contact is adequate.
•Sand or mud in the female contact should be removed with fresh water. Failure to do so could result
in splaying of the female contact and damage to the O-ring seals.
•Do not over tighten the bulkhead nut.
•Do not disconnect by pulling on the cable. Avoid sharp bends at cable entry.
•When disconnecting, pull straight, not at an angle.
•Do not apply angular loads (shears) to the bulkhead connector, as they can damage or destroy the
connector.
7.3 Determining the Cause of Malfunctions
Apart from the procedures described below, your Model 802
DeepWater tiltmeter is not field
serviceable. If you encounter problems not described here, please contact Jewell Instruments at telephone
[phone], fax [phone] or email us at [email protected]. A sales representative
will assist you in determining the cause of any problem.
If there is no output when the tiltmeter is connected to a power supply (or to the Model 870
Readout Module), first check that your multimeter or recording device has adequate power and is
functioning properly. Then check the power supply to be sure that it is providing power to the tiltmeter.
Verify that all connectors are securely attached. Failure to obtain an output signal from the tiltmeter
normally is the result of lack of power or a broken wire or connection.
If the tiltmeter output is firmly “pegged” at either end of its output range, the tiltmeter is probably
tilted off scale. Rotate the tiltmeter in the opposite tilt direction to check this possibility. The tiltmeter
output should pass through zero volts as you move it through its null (level) position. Remember that the
response is not instantaneous because of the time constant of the filter. However, no more than a few
seconds should elapse before the tiltmeter responds as it moves through null.
If the tiltmeter output remains “pegged” at its positive or negative limit no matter how much you
move it, the cause may be a broken connection or short circuit where the sensor lead wires connect to the
printed circuit board (Figure 7). Do not use an ohmmeter to check the sensor connections, as doing so

B-03-1004, Rev. F –Model 802 DeepWater Submersible Tiltmeter
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will permanently damage the sensor. Visually inspect the lead wires and circuit board connector to verify
that the connections are properly made. If this inspection still fails to identify the problem, contact the
factory for assistance or to arrange for a repair.
8. Warranty and Assistance
Your Model 802 DeepWater tiltmeter is warranted against defects in materials and workmanship
for one year from the date of delivery. We will repair or replace (at our option) products that prove to be
defective during the warranty period provided they are returned prepaid to Jewell Instruments LLC. No
other warranty is expressed or implied. The warranty is void if the equipment is subjected to lightning
strikes or other large potential gradients, or if it is otherwise used contrary to the directions herein. After
expiration of the warranty, JEWELL will repair the equipment at its factory for parts and labor charges.
Products returned after warranty expiration should be accompanied by a purchase order to cover repair
costs. Jewell Instruments LLC is not liable for consequential damages.
THE REMEDIES PROVIDED HEREIN ARE THE BUYER’S SOLE AND EXCLUSIVE REMEDIES.
JEWELL INSTRUMENTS SHALL NOT BE LIABLE FOR ANY DIRECT,
INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, WHETHER BASED ON
CONTRACT, TORT OR ANY OTHER LEGAL THEORY.

B-03-1004, Rev. F –Model 802 DeepWater Submersible Tiltmeter
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Figure 1. Model 802
DeepWater Tiltmeter
Figure 2. Model 802
DeepWater Tiltmeter with Connector and Cable Whip

B-03-1004, Rev. F –Model 802 DeepWater Submersible Tiltmeter
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Figure 3. High-Pressure Connector and Cable Whip
Figure 4. Tiltmeter with Bi-Axial Tilt Configuration
Delrin locking
sleeve
Neoprene
connector