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DB1 Liquid Level Measurement Sensor
fluctuates between 5 and 15 ft (2.2 and 6.5 psi), set the pressure regulator
above 7 psi (read 10 psi) to ensure adequate pressure.
Open the nitrogen bottle valve, set the pressure regulator, and adjust the
nitrogen flow by adjusting the two needle valves. The suggested bubble rate is
1 to 3 bubbles/seconds. The nitrogen gas bottle, regulator, and tubing
(Campbell P/N 7567) are available from any welding supply store. Use
common sense when installing pressure lines, checking for leaks, moisture,
kinks, etc. in the lines.
The DB1 does not have a mechanism to stop the flow of gas through the two
submerged tubes so gas will be flowing constantly. This is very effective in
reducing the growth of biomass in the tubes, which could otherwise reduce or
block the flow of gas. If you wish to conserve gas, you can install a 12 Vdc
solenoid valve between the gas bottle and the DB1 manifold and use the
SW12V port on the datalogger to open the valve just prior to a measurement.
This will result in slower consumption of nitrogen but may result in biomass
build-up in the mouth of the tubes.
4. Wiring
Wiring connections for the CR800, CR850, CR1000, and CR10(X)
dataloggers are shown in Figure 3. The channel numbering in the wiring
diagram matches the channel usage in the program examples. The pressure
transducer within the DB1 has four conductors (white, green, red, black). The
white lead connects to the high side and the green lead connects the low side of
any analog channel (e.g. 1H and 1L). The red lead connects to any excitation
channel and the black lead connects to any analog ground channel.
The three relay cable assemblies have three conductors for each valve. The
green wires connect to control ports C1 (Valve #1), C2 (Valve #2), and C3
(Valve #3) as used in the program example that follow. The red wires connect
to 12 volts, and the black wires connect to ground. The cable assemblies have
been provided with extra lead length to enable the user to cut the cables to
length to accommodate different size enclosures.
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