Metex 2200D/P91 Dissolved Oxygen Controller/Analyzer - Manual (Page 14)

Model 2200D/P91 Page 12
4.9 Output Hold
4.9.1 Output hold, is a function which freezes all output signals at the last value to
prevent the occurrence of wild distortions during programming and maintenance.
4.9.2 When the Operation Menu is entered by pressing CALL, the alarm relays and the
analog outputs are automatically placed on hold and remain on hold until the
instrument returns to on line. The output hold will remain for a maximum of 10
minutes after the last button was pressed, if this feature has been enabled. See
Section 4.8.
4.10 Parameter and Operation Checking
4.10.1 The instrument continuously checks all parameters in its memory, while taking D.O.
readings. When it detects an invalid value, it flashes the LEDs in the operation
menu to indicate the parameter is at fault. You must then access the operation
menu to take corrective actions.
4.11 Simulated Input for Testing
4.11.1 TEST is function for test and diagnostic purposes. Values can be simulated
internally and adjusted with the arrow buttons to set display reading and analog
outputs to any desired value without disrupting instrument calibration.
4.12 Utility Menu
4.12.1 The Utility Menu is provided to enable authorized personnel to change the range
and fine tune the analog . See Section 7.0.
4.13 Watchdog Timer and Self Diagnostics
4.13.1 The 2200D continuously monitors the condition of all key components of the
measuring system to ensure that the measurements are reliable. Invalid entries and
memory loss are indicated on the panel. See Section 8.0.
5.0 START-UP AND OPERATION
5.1 Password
5.1.1 To enter the menu press CALL then PASSWORD will be indicated. With each
press of CALL you will step through the menu. When the last item is reached the
menu wraps around to “%sat/ppm”. If you have enabled PASSWORD by placing
DIP Switch 2 Bank S1, in the off position you must enter the password “6” when
PASSWORD is indicated if you wish to change any stored value. You do not need
to enter the password to proceed to other items in the menu for recall of stored
values.
If PASSWORD has not been enabled you do not need to enter the password to
change stored values.