Display - Emerson Rosemount Analytical HART 5081-A-HT Instruction Manual

MODEL 5081-A

7.5 DISPLAy

7.5.1 Purpose
This section describes how to do the following:
1. Configure the transmitter to measure oxygen, free chlorine, total chlorine, or ozone
2. Choose concentration units
3. Set the temperature units to °C or °F
4. Set the output to current or percent of full scale
5. Enter a security code.
7.5.2 Definitions
1. MEASUREMENT. The transmitter can be configured to measure dissolved oxygen (ppm and ppb level), free chlorine,
total chlorine, or ozone.
2. FREE CHLORINE. Free chlorine is the product of adding sodium hypochlorite (bleach), calcium hypochlorite (bleaching
powder), or chlorine gas to fresh water. Free chlorine is the sum of hypochlorous acid (HOCl) and hypochlorite ion (OCl - )
3. TOTAL CHLORINE. Total chlorine is the sum of free and combined chlorine. Combined chlorine generally refers to
chlorine oxidants in which chlorine is combined with ammonia or organic amines. Monochloramine, used to disinfect
drinking water, is an example of combined chlorine. The term total chlorine also refers to other chlorine oxidants such
as chlorine dioxide. To measure total chlorine, the sample must first be treated with a mixture of acetic acid and potas-
sium iodide. Total chlorine reacts with iodide to produce an equivalent amount of iodine, which the sensor measures.
4. OUTPUT CURRENT. The transmitter generates a 4-20 mA output signal directly proportional to the concentration of oxy-
gen, chlorine, or ozone in the sample. The output signal can be displayed as current (in mA) or as percent of full scale.
5. SECURITY CODE. The security code unlocks the transmitter and allows access to all menus.
7.5.3 Procedure
PROGRAM
dISPLAY
EXIT NEXT ENTER
PROGRAM
tYPE
02
EXIT ENTER
PROGRAM
Unit
PPb
EXIT ENTER
PROGRAM
sensor
Sd01
EXIT ENTER
1. Press PROG on the remote controller.
2. Press NEXT until the diSPLAy submenu appears. Press ENTER.
3. Press é or ê to display the desired measurement. Press ENTER to save.
O2 Dissolved oxygen (go to step 4)
CLrA Monochloramine
tCL Total chlorine
FCL Free chlorine
O3 Ozone (go to step 7)
Although monochloramine is a choice, a monochloramine sensor is NOT currently
available from Rosemount Analytical.
4. If you chose O2 in step 3, the screen at left appears. Press é or ê to display the de-
sired units: ppm, ppb, or %. Press ENTER to save. Also, refer to step 6 for recom-
mended settings to make for different types of sensors.
5. The screen at left appears. Press é or ê to display the type of sensor. Press ENTER
to save.
AdO 499ADO
trdO 499ATrDO
SdO1 Hx438 or Gx448 steam-sterilizable sensor
SdO2 Steam-sterilizable sensor from other manufacturer
Refer to step 6 for recommended sensor/unit combinations.
PROGRAMMING
Procedure continued on following page.
SECTION 7.0
39