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MODEL 3081 pH/ORP SECTION 8.0
PROGRAMMING FOR pH MEASUREMENTS
SECTION 8.0
PROGRAMMING FOR pH MEASUREMENTS
8.1 General
8.2 Entering and Leaving the Program Menu
8.3 Output Ranging
8.4 Diagnostic Parameters
8.5 Temperature Related Settings
8.6 Display Units
8.7 Buffer Calibration Parameters
8.8 Isopotential Parameters
8.9 Generating a Test Current
8.1 GENERAL
This section describes how to do the following:
1. assign pH values to the 4 and 20 mA outputs,
2. set the current generated by the transmitter during hold,
3. set the current generated by the transmitter when a fault is detected,
4. change sensor diagnostic limits,
5. enable and disable automatic temperature compensation,
6. change the units of the displayed variables,
7. program a security code,
8. identify buffers for auto calibration,
9. change the transmitter isopotential point,
10. simulate output currents for testing.
Factory default settings are given in Table 8-1. If default settings are acceptable, the transmitter is ready for calibration.
See Section 7.0, Calibration of pH Measurements. Once a setting has been changed, there is no way to automatically
reset the transmitter to factory defaults. Settings must be returned to default values one at a time. Figure 5-4 shows the
menu tree.
8.2 ENTERING AND LEAVING THE PROGRAM MENU
Press PROG on the infrared remote controller (IRC) to enter the Program menu. To save new settings, press
ENTER. To leave the Program menu without saving new values, press EXIT . Pressing EXIT with a prompt showing
returns the display to the first prompt in the sub-menu. Pressing EXIT again returns the transmitter to the process
display.
If program settings are protected with a security code, pressing PROG or CAL will cause the Id screen to appear.
Key in the security code and press ENTER . The first sub-menu will appear. For more information, see Section 5.7,
Security.
A transmitter adjacent to the one being programmed may pick up signals from the IRC. To avoid accidentally changing
settings, use a different security code for each nearby transmitter. See Section 5.7, Security, and Section 8.6, Display
Units, for details.