Omega Products CLDTX-100 User Manual
CLDTX-100 Series
SECTION 1.0
THEORY OF OPERATION
1.0 CHLORINE DIOXIDE INTRODUCTION. Chlorine dioxide is
considered one of the most powerful biocides available today.
It is so effective that it was used to disinfect sites infected
with the SARS virus and is used to disinfect areas know to be
contaminate with Legionella sp. One of the most important
properties of ClO2 that sets it apart from chlorine is its behavior when placed in water. Not only is ClO2 10 times more
soluble in water than chlorine (3.01 grams/Liter at 25 degrees
C), it doesn't hydrolyze when placed in solution. It remains as
a "true" dissolved gas that retains its useful oxidative and biocidal properties throughout the entire 2 to 10 pH range.
1.2 SENSOR OPERATING PRINCIPLE. Chlorine dioxide gas
diffuses across the sensor's hydrophobic silicone membrane
between the cathode and electrolyte solution. At the applied
potential, it is electrochemically reduced at the gold cathode
as:
ClO2 + 4H+ + 5e- ---> Cl- + 2 H2O
At the same time, the silver anode is oxidized to form silver
chloride (AgCl) as:
Cl- + Ag ---> AgCl + e-
The release of electrons at the cathode and acceptance at the
anode creates a current flow, which under constant conditions,
is proportional to the chlorine dioxide concentration in the
medium outside the sensor. The resulting low current output
is then conditioned to 4-20mA current by the sensor's onboard electronic circuitry.
PRODUCT INSTRUCTION SHEET
SECTION 2.0
FACTORS INFLUENCING THE SENSOR
2.1 pH. As dicussed in Section 1, there is no significant pH
dependence when measuring ClO2.
2.2 Chemical Interferences. The sensor should not be used in
water containing surfactants.
2.3 FLOW. The membrance covered chlorine dioxide sensors
(CLD series) function at any flow rate. To acheive reproducible measurements, these sensors require a specified constant
flow rate. To avoid complications (such as bubbles), it is best to
operate the sensors at a flow rate of 0.2-0.6 gpm.
Parts covered by this product instruction sheet include: CLDTX-100 Series
M4678/0708 page 1 of 6
PRODUCT INSTRUCTION SHEET
SECTION 3.0
SENSOR PREPARATION
3.0 CHLORINE DIOXIDE SENSOR ASSEMBLY. Your Chlorine Dioxide sensor is shipped with the membrane cap (CLDA-2016)
pre-installed and covered with a cap with water inside to keep
the membrane wet.
NOTE: IF SENSOR WILL BE STORED DRY OUT OF FLOW CELL,
SHAKE BODY DOWNWARD INTO A SINK TO REMOVE THE FILL
SOLUTION. TAKE THE MEMBRANE CAP AND IMMERSE IN A
CUP OF TAP WATER UNTILL READY TO REUSE. SEE SECTION 9.
REPLACE CAP AND ELECTROLYTE BEFORE INSTALLING INTO
FLOW CELL (see SECTION 10 for cap and electrolyte change.
See SECTION 5 for sensor installation into flow cell).
SECTION 4.0
FLOW CELL INSTALLATION
4.0 FLOW CELL. To obtain accurate Chlorine dioxide reading,
the Sensor must be installed into the Flow Cell to prevent air
bubbles formation on the membrane, proper spacing between
the sensor and the installation wall, and laminar flow across
the membrane.
4.1. Using two 1/4” NPT Tube fittings, connect the Flow Cell
into your system, noting the inlet (bottom) and outlet (side)
orientation. (see FIGURE 1)
4.2. Install clamp with rubber backing as shown in FIG. 2.
4.3 Drill 3/8" diameter hole on the panel.
4.4 Insert bolt as shown in FIG 2
4.5 On back of panel attach lock washer and nut to secure
clamp and flow cell to panel.
FIG.1
SENSOR
SNAP RING
GROOVE
THREADED FITTING
SNAP RING (INSTAL L S
INTO PROBE GROOVE)
O-RING
BARBED TUBE
FITTING
FLOW CELL
BARBED TUBE
FITTING
FIG. 2
SECTION 5.0
SENSOR INSTALLATION
5.0 SENSOR INSTALLATION INTO FLOW CELL.
a. First install threaded fitting onto sensor body
(remove fitting if pre-installed in flow cell)
b. Install snap-ring into groove on sensor body
c. Next, slide o-ring onto body of sensor until it
reaches bottom of threaded fitting.
d. Thread sensor assembly into top of flow cell as
shown in FIGURE 2.
d. Turn on flow and verify the flow through the Flow
Cell is at least 0.2gpm (45 liters/hour and no
more than 0.6gpm (135 liters/hour).
Parts covered by this product instruction sheet include: CLDTX-100 Series
M4678/0708 page 2 of 6
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