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Calibration Procedures Model 360E Instruction Manual
7.5.2. Use of Zero/Span Valves with Remote Contact Closure
Contact closures for controlling calibration are located on the rear panel CONTROL IN connector. Instructions
for setup and use of these contacts are found in Section 6.15.1.2. When the contacts are closed for at least 5
seconds, the instrument switches into zero or span mode. The remote calibration contact closures may be
activated in any order. It is recommended that contact closures remain closed for at least 10 minutes to
establish a reliable reading.
The instrument will stay in the selected mode for as long as the contacts remain closed. If calibration is enabled,
the M360E will re-calibrate when the contact is opened, then go into SAMPLE mode. If calibration is disabled,
the instrument will return to SAMPLE mode, leaving the calibration unchanged.
7.6. Automatic Zero/Span Cal/Check (AutoCal)
The AutoCal system allows unattended periodic operation of the ZERO/SPAN valve options by using the
M360E’s internal time of day clock. AutoCal operates by executing SEQUENCES programmed by the user to
initiate the various calibration modes of the analyzer and open and close valves appropriately. It is possible to
program and run up to 3 separate sequences (SEQ1, SEQ2 and SEQ3). Each sequence can operate in one of
3 Modes, or be disabled.
Table 7-1: AUTOCAL Modes
MODE NAME ACTION
DISABLED
Disables the Sequence
ZERO
Causes the Sequence to perform a zero calibration/check
ZERO-SPAN Causes the Sequence to perform a zero and span concentration
calibration/check
SPAN Causes the Sequence to perform a span concentration
calibration/check
For each mode there are seven parameters that control operational details of the SEQUENCE. They are:
Table 7-2: AutoCal ATTRIBUTE Setup Parameters
ATTRIBUTE NAME ACTION
TIMER ENABLED
Turns on the Sequence timer
STARTING DATE
Sequence will operate after Starting Date
STARTING TIME
Time of day sequence will run
DELTA DAYS
Number of days to skip between each Seq. execution
DELTA TIME
Number of hours later each “Delta Days” Seq is to be run
DURATION
Number of minutes the sequence operates
CALIBRATE
Enable to do a calibration – Disable to do a cal check only
148 05232 Rev B3