Emerson Rosemount SOLU COMP II - Temperature Compensation and Units

29
5.6.3 Procedure.
To choose a menu item, move the cursor to the item and press ENTER.
To store a number or setting, press ENTER.
1. Press MENU. The main menu screen appears. Choose Program.
2. Choose >>.
3. Choose Temp.
4. Choose °C/F to change temperature units. Choose Live/Manual to turn
on (Live) or turn off (Manual) automatic temperature compensation.
a. If °C/F is chosen, select °C or °F in the next screen.
b. If Live/Manual is chosen, select Live or Manual in the next screen.
c. If Manual is chosen, enter the temperature in the next screen. The
temperature entered in this step will be used in all subsequent meas-
urements, no matter what the process temperature is.
Calibrate Hold
PPrrooggrraamm
Display
Config Temp?
°
CC//FF
Live/Manual
TTeemmpp
Security
>>
Outputs Alarms
Measurement
>>>>
MODEL SOLU COMP II SECTION 5.0
PROGRAMMING THE ANALYZER
5.6 CHOOSING TEMPERATURE UNITS AND MANUAL OR AUTOMATIC TEMPERATURE
COMPENSATION
5.6.1 Purpose
This section describes how to do the following:
1. Choose temperature display units (°C or °F).
2. Choose automatic or manual temperature compensation for membrane permeability.
3. Enter a temperature for manual temperature compensation.
5.6.3 Definitions
1. AUTOMATIC TEMPERATURE COMPENSATION
The ozone sensor is a membrane-covered amperometric sensor. The permeability of the membrane is a func-
tion of temperature. As temperature increases, membrane permeability increases. Thus, an increase in tem-
perature will cause the sensor current and the analyzer reading to increase even though the ozone level
remained constant. A correction equation in the analyzer software automatically corrects for changes in mem-
brane permeability caused by temperature. In automatic temperature compensation, the analyzer uses the
temperature measured by the sensor for the correction.
2. MANUAL TEMPERATURE COMPENSATION. In manual temperature compensation, the analyzer uses the
temperature entered by the user for membrane permeability. It does not use the actual process temperature.
Do NOT use manual temperature compensation unless the measurement and calibration temperatures differ
by no more than about 2°C. Manual temperature compensation is useful if the sensor temperature element
has failed an a replacement sensor is not available.