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3.3 Zero/span valves (Option)
If the Zero/Span Valves option has been installed the operator can check the zero and
span setpoints of the analyzer at any time by pressing the CALZ or CALS button.
Zero and Span checks using the Zero/Span Valves option is identical to that described in
Section 3.2 except that external zero and span gas is supplied to the analyzer through a
zero/span valve located on the rear panel of the instrument.
3.4 Automatic zero/span check
Automatic zero/span checking (Z/S check) must be enabled in the setup mode. The
Teledyne API Model 300 Carbon Monoxide Analyzer with IZS or Zero/Span Valves option
offers capability to check the zero and span point automatically on a timed basis, or through
remote RS-232 operation(see Section 3.7).
Under the SETUP-ACAL menu, there are three separate auto-sequences called SEQ1,
SEQ2, and SEQ3. Under each SEQ, there are eight setup parameters that affect zero/span
checking: the mode, the starting date of the check, the time of day for check, the number
of delay days, time delay, the duration of the check, the range to check and whether to
calibrate as well as check the range. These are described individually below. Use the
PREV and NEXT buttons to scroll through the three sequences. The mode for each
sequence is displayed. To change the mode for any of the sequences, scroll to the desired
sequence and press the MODE button. Use the PREV and NEXT buttons to select one
of the modes shown below and press ENTR.
Mode:
1. DISABLED (Sequence is disabled)
2. ZERO
3. SPAN
4. ZERO-SPAN
To change the setup parameters for a sequence, press the SET button. Pressing the <SET
and SET> buttons allows you to scroll through the setup parameters and edit them by
pressing the EDIT button. The function of each setup parameter is described below:
Timer Enabled: When set to ON, the sequence will be executed based on the internal
timer, as specified in the following parameters. When set to OFF the sequence will be
executed only upon an external (RS-232) command.
Starting Date: The starting date for the sequence is entered in the format of
MM/DD/YY, where MM is the month, DD is the date, and YY is the year. Enter starting
date and press ENTR or EXIT to leave the date unchanged.
Starting Time: To set the time of day for the sequence, enter in the format HH:MM,
where HH is the hour in 24-hour format (i.e. hours range from 00 to 23) and MM is the
P/N 02163G1 Teledyne API Model 300 CO Analyzer Instruction Manual - Page 33