1 Description and Specifications
1.1 Features
Rosemount TCL Sample Conditioning System
The sample conditioning system permits a single sensor to measure total chlorine in water.
The sample conditioning system continuously injects a solution of acetic acid (vinegar) and
potassium iodide into the sample. The acid lowers the pH to between 3.5 and 4.5 and
allows total chlorine in the sample to quantitatively react with the potassium iodide to
produce iodine. The sensor measures the iodine concentration, and the transmitter
displays the total oxidant concentration in ppm as Cl
2
.
Rosemount 56 Transmitter
The Rosemount 56 Transmitter measures total chlorine when used with the TCL and
499ACL-02 sensor.
The transmitter is housed in a corrosion resistant NEMA 4X enclosure. It is suitable for
panel, pipe, or wall mounting. The large, high resolution, full color display shows total
chlorine concentration and temperature in 0.5 in. (13 mm) high characters. Six other user-
selectable variables can be shown in smaller characters. Operation of the transmitter is
through the membrane keypad.
Menu screens for calibration and programming screens are simple and intuitive. Plain
language prompts in nine languages guide you. Information about program settings and
calibration, as well as troubleshooting guidance, is available on-screen at the press of a
button.
The transmitter has four fully programmable analog outputs, with HART digital
communication superimposed on output 1. Profibus DP digital communication is available
as an option. PID control is standard.
Four fully programmable relays are available. Relays can be configured as simple high/low
setpoint alarms or can be used to perform a number of timer functions as well as time
proportional control (TPC). For more information about relay actions, refer to the
Rosemount 56 Product Data Sheet.
A data and event logger are standard. The data logger stores up to 30 days of data, and the
event logger stores up to 300 events. Events can be viewed on screen, and data can be
shown in a full color dual graphics display. Data and events can also be downloaded
through a USB port on the front panel of the transmitter.
Rosemount 499ACL-02 Total Chlorine Sensor
The Rosemount 499ACL-02 Total Chlorine Sensor is used in the TCL sample conditioning
system. Although the sensor is called a chlorine sensor, it really measures iodine. The
iodine comes from the reaction between oxidants in the sample and the acetic acid/
potassium iodide reagent added by the sample conditioning system.
Description and Specifications
Manual 1
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