The sensor consists of a gold cathode and a silver anode in an electrolyte solution. A
silicone membrane, permeable to iodine, is stretched over the cathode. The transmitter
applies a voltage to the cathode sufficiently negative to reduce all the iodine reaching it.
Because the concentration of iodine in the sensor is always zero, a concentration gradient
continuously forces iodine from the sample through the membrane into the sensor.
The reduction of iodine in the sensor generates a current directly proportional to the
diffusion rate of iodine through the membrane, which is directly proportional to the
concentration of iodine in the sample. Because the iodine concentration depends on the
amount of total chlorine in the sample, the sensor current is ultimately proportional to the
total chlorine concentration.
The permeability of the membrane to iodine is a function of temperature. A Pt100 RTD in
the sensor measures the temperature, and the transmitter uses the temperature to
compensate the total chlorine reading for changes in membrane permeability.
Sensor maintenance is fast and easy. Replacing the membrane requires no special tools or
fixtures. Simply place the membrane assembly on the cathode and screw the retainer in
place. Installing a new membrane and replenishing the electrolyte takes only a few
minutes.
1.2 Specifications
Sample Conditioning SystemTable 1-1:
Physical characteristics Specifications
General
Enclosure Fiberglass reinforced polyester, NEMA 3 (IP53)
suitable for marine environments
Dimensions 14.5 x 13.0 x 8.6 in. (369 x 329 x 218 mm)
Mounting Wall
Ambient temperature 0 to 50 °C (32 to122 °F)
Ambient humidity 0 to 90% (non-condensing)
Power 115 Vac, 6.9 W, 50/60 Hz
230 Vac, 7.0 W, 50/60 Hz
Hazardous location The TCL Sample Conditioning System has no
hazardous location approvals.
Pumps
EN 809:1998
Weight/shipping weight 14 lb/16 lb (6.5 kg/7.5 kg)
Sample requirements
Inlet connection Compression fitting, accepts 1/4 in. OD tubing
Drain connection 3/4 in. barbed fitting (must drain to open at-
mosphere)
Inlet pressure <100 psig (791 kPa abs)
Description and Specifications
2 Rosemount TCL
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