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Section 5 Deployment
5.1 Deployment Considerations
5.1.1 Pressure Extremes
Note: The multiprobe maximum immersion depth is 225 meters (738 feet).
Note: The ion specific sensors (Nitrate, Ammonia, and Chloride) maximum deployment depth is
15 meters.
Important Note: The 0–10 meter vented depth sensor should be protected from depths
over 15 meters (49 feet) by installing the seal screw (provided in the basic maintenance
kit) in the face of the multiprobe sensor cap. Likewise, the 0–25 depth sensor should be
protected from depths over 35 meters (164 feet) by installing the same seal screw.
However, the 100- and 200-meter depth sensors do not require installation of the seal
screw.
The mulitprobe may be equipped with one of the following depth options:
0–10 meters (33 feet), 0 to 25, 0 to 100, and 0 to 200 meters (82, 328, and 656 feet).
The first option is used to detect water level changes that are automatically compensated
for barometric pressure changes. Applications include tidal waters, rivers, stream, lakes,
reservoirs, and groundwater. The vented level option must have a fixed cable with a vent
tube. The second, third, and fourth options are usually used to determine the depth in the
water column at which the other parameter readings are made.
5.1.2 Temperature Extremes
The multiprobe storage temperature range is 1 to 50 °C (34 to 122 °F), non-freezing, when
going or coming back from a deployment site, or when storing the multiprobe.
The mulitprobe operating temperature range is –5 to 50 °C (23 to 122 °F), non-freezing.
Exposing the multiprobe to temperatures outside this range may result in mechanical
damage or faulty electronic performance.
To prevent sensors from freezing, store the multiprobe where freezing will not occur.
To prevent the sensors from dehydrating, fill the DS storage cup or MS cup with one inch
of clean tap water.
Always rinse the multiprobe with clean tap water after deployment.
5.1.3 Data Transmission Lines
When adding a transmission cable to the multiprobe, the cable must be large enough to
carry the operating current and transfer data without distortion. For up to a total of 305 m
(1000 ft) of cable, three 26 AWG wires are suitable for data transmission, but two 18 AWG
must be used for the power wires. Alternatively, smaller power wires can be used if the
power supply is placed closer to the multiprobe. A cable extension kit is available for
above-ground applications (Replacement Parts and Accessories on page 47).
5.1.4 Minimum Depth Requirements
Sensors must be immersed. The Standard Turbidity Sensor minimum deployment depth
is 1 meter.
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