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WorkHorse Monitor/Sentinel Deployment Guide
Zero the Pressure Sensor
Zero the pressure sensor at the deployment site, prior to deploying the Monitor/Sentinel ADCP in the wa-
ter.
To zero the pressure sensor:
1. Setup the communication parameters between TRDI Toolz and the ADCP.
2. Wake up the ADCP by pressing the
3. Enter the AZ direct command to send to the ADCP and then press the Enter key or click on
Send.
Calibrating the ISM Compass
This section applies to the WHII electronics only. See How do I know if I have WH or WHII
electronics? to determine what electronics are installed in the system.
The main reason for compass calibration is battery replacement. Each new battery carries a different mag-
netic signature. The compass calibration algorithm corrects for the distortions caused by the battery to
give you an accurate measurement.
To achieve the best possible field calibration of the compass, the compass calibration should be per-
formed:
•
In a "magnetically clean" environment, i.e., in an area free from stray magnetic fields (elec-
tronics, power lines, etc.) and magnetic materials such as iron.
•
As close as possible to the actual deployment site (so that during calibration the instrument is
measuring a magnetic field intensity and dip angle that are as close as possible to the as-de-
ployed environment)
•
With a large variety of instrument orientations (ideally tilting the instrument by 30 degrees or
more during orientation).
•
TRDI recommends that if you are having trouble calibrating the Workhorse II ADCP compass
that you move the system and/or ensure the area around the system is clear of electrical
equipment and ferrous materials.
In an oil & gas environment, it is typically impossible to meet the first two requirements
above. Oil fields are full of metal structures that preclude a "magnetically clean"
environment. Even in standard oceanography, for example a deep-water deployment in the
open ocean, it is not possible to meet both requirements because any location reasonably
near the deployment site is aboard a ship, which will be a decidedly magnetically dirty
environment. Therefore, the customer typically must choose between calibrating a long way
away from the deployment site or use the factory default calibration and then post-calibrate
the data (see Compass Post Calibration).
To calibrate the internal ISM
1. Go outside, away from magnetic materials.
2. Start the ISM Compass Calibration software and set up the communication pa-
rameters between the software and the ADCP.
button.
compass:
EAR99 Technology Subject to Restrictions Contained on the Cover Page.
P/N 957-6285-00 (July 2023)
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