PART THREE - OPERATION
SECTION 8 - USING SECURITY LOCK FEATURE
Rev. 9-898
Model 692P
-43-
7.2 Using Output Hold
Feature
3. Press
ENTER
key to enter value (display flashes “OK” to
confirm entry or “VALUE ERROR” if difference between
entry value and LO OUT VALUE is less than 1.00 pH
unit).
The isolated 4-20 mA analog output can be held during
calibration or while setting up the instrument to suspend
operation of a receiving device.
Simultaneously pressing the
OUTPUT
key and recessed
END CAL/HOLD
button activates the hold mode feature.
Immediately, the
HOLD
status indicator appears and the
output value is held for 30 minutes -- unless the hold feature
is extended or cancelled. Thirty seconds before the 30-
minute hold period expires, the
HOLD
indicator flashes to
alert you that hold is about to be automatically canceled.
Pressing the
OUTPUT
key again extends the hold period
for another 30 minutes. You can cancel the output hold
feature at any time by simultaneously pressing the
CANCEL
HOLD
and
OUTPUT
keys.
SECTION 8 - USING SECURITY LOCK FEATURE
8.1 Locking
Stored Values
The security lock feature prevents unauthorized alteration
of stored values. When the 692 is locked, the display shows
the
LOCK
status indicator, alerting you that stored setup
variable values
including preset calibration points for
both “two-key” methods
cannot be changed. However,
you can calibrate the 692 using any method, and you can
display all stored values.
1. With display in pH measuring mode, press
EXAM/
CANCEL
key to place display in “examination” mode.
2. Press
NEXT
key until display indicates “SLOPE”. Then
press
NEXT
key once more to display “0000” (identifier
for security lock feature).
3. Use
ñ
ñ
key to make display indicate the lock code
“0001.”
4. Press
ENTER
key to enter lock code (
LOCK
status indi-
cator appears and display flashes “OK” to confirm code
entry).
5. Press
EXAM/CANCEL
key to return display to pH
measuring mode.
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