Electro-Chemical Devices (ECD) HYDRA Ammonium - Manual (Page 14)

Page 6 HYDRA NH
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2.3 MOUNTING
2.3.1 C-22 Analyzer
Mount the C-22 in a location where there is easy access to the analyzer and sensors. Install the system
in an area where vibrations, electromagnetic and radio frequency interference are minimized or absent.
Do not mount in direct sunlight or areas of extreme heat (temperature > 120°F). The NEMA 4X C-22 is
suitable for outdoor use but it is best to mount it with a protective cover or sunshield.
There are three basic installation methods for the C-22, Wall Mount (UM), Panel Mount (PM) and Pipe
Mount (HM). The Pipe Mounting hardware includes 2” “U” bolts for attaching to standard 2” handrails.
(See the installation drawings in Section 9.3 at the rear of the manual)
2.3.2 Hydra Sensor
Install the sensor where the measured sample is representative of the entire process. Although the
sensor will function in a quiescent sample, flow improves the measurement. The recommended
minimum flow is 0.1 m/sec.
Securely mount the HYDRA sensor with the measuring end at least 6”away from the tank wall and
bottom. Ensure that the sensor is immersed at least 6” at all times.
Use care when servicing the sensor to ensure that the sensor does not hit the tank wall or bottom which
could break the sensing electrodes.
2.4 WIRING
Electrical wiring should only be conducted by qualified personnel. See the wiring color code for the
Hydra Sensor and the C-22 wiring diagram in Section 7.3 below.
2.4.1 Wiring, power
Attach power cable as shown in the diagram in Section 7.3 or the inside of the C22 cover. Feed the cable
through the gland fitting on the right hand side of the C-22. Tighten the cable gland to provide a good
seal to the cable. The instrument can be powered up at this point with no harm to the analyzer but it is
best to wait until the sensors are installed.
2.4.2 Wiring, Sensor
Attach the sensor wires as described on the diagram inside the C22 cover. Feed the sensor cable
through the gland fitting on the left hand side of the C-22. Do not use the same gland fitting for the AC
power or Alarm/Relays. The green terminal strip connectors are detachable from the circuit boards.
Remove the connector by pulling straight back from the circuit board.
2.4.3 Wiring, 4-20 mA Outputs
The 4-20 mA output is an unpowered output, 24V can be supplied from an external source, the PLC or
DCS receiving the signal or from the internal PS2 power supply.
If the internal PS2 Power Supply is used, first connect a jumper wire between Terminal #1 (RTN) on the
PS2 Power Supply Board and Terminal #2 of the 4-20 mA 1 output connector, the two slot connector on