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2.0 INSTALLATION
2.1 U
NPACKING
Carefully remove the HYDRA-DS sensor from its shipping container. Inspect the sensor for damage. Verify the
electrodes, Ammonium, Potassium, and pH and the Spray Cleaner Nozzle are installed in the sensor housing. The
electrodes should be hand tightened into place so that the sealing o-rings are not visible. The electrodes are supplied
with protective caps that must be removed before start up. Do not remove the caps until ready to use.
***Never support the HYDRA-DS Sensor by the cable, irreparable damage will occur***
2.2 A
SSEMBLY
The Hydra-DS Sensor is shipped completely assembled. Before use, it must be connected to the analyzer and an air
supply. Connect the spray cleaner feed tube to a compressed air supply controlled by a solenoid valve (not supplied).
Attach an immersion/support tube (not supplied). Finally connect the sensor wires and 110 VAC power to the analyzer
as shown on the wiring diagram. Connect the Cleaner Relay to the solenoid, and connect the 4-20 mA Output(s) and
Alarm Relays to the Control System (PLC or DCS). The HYDRA-DS is then ready to use.
2.2.1 S
C
PRAY
LEANER
The Spray Cleaner uses compressed air to create turbulence around the electrodes which removes dirt and films from
the measurement surfaces. Depending on the process being measured the cleaner should be actuated for 15-30
seconds every 0.25-2 hour period. The spray cleaner connection is a ¼" compression fitting and requires between 35-
75 psi air pressure. The air supply is controlled with a user supplied solenoid valve through Relay 1 in the T80 analyzer.
The solenoid valve should be a 110 AC powered, < 10 watt devices. Wire the solenoid to Relay 1 as described in Section
2.4.4 below.
If no air supply is available use the ECD Model AC10 Air Blast Spray Cleaner compressor. The AC10 uses redundant intake
air filters and redundant fuses on both the relays and the compressor. A highly reliable high current contactor assures
years of trouble free service. The 115 VAC 3.0 Amp or 220 VAC 1.3 Amp Air Compressor is housed in a rugged, corrosion
resistant, hot compression molded, fiberglass reinforced polyester enclosure with a stainless steel piano hinge to secure
the cover to the base. The AC10 can be wall mounted or use the optional 2" handrail mounting system that uses stainless
steel support rails with two 2" galvanized pipe clamps.
***Never support the HYDRA-DS Sensor by the cable, irreparable damage will occur***
2.2.2 I
/S
MMERSION
UPPORT
Feed the cable and compressed air line through the immersion/support tube (not supplied). Connect a support tube to
the 1 ¼" MNPT thread at the rear of the sensor. The HYDRA-DS Sensor weighs approximately 5.3 lbs. The support tube
must be able to support the weight of the HYDRA-DS Sensor in the user's installation, whether vertical or angled. The
recommended material for the immersion tube is 1.5" Schedule 80 PVC pipe with a reducer fitting to 1 ¼" FNPT.
HYDRA-DS NO
-N
3
T
UBE
Page 15
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