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ALARM 1 - Mode
The symbol displayed in the "x" position indicates the mode of the alarm as follows;
0 - Alarm off; H - High; L - Low. Press the arrow buttons to change the mode and press the
Edit button once to store the setting. The display will change to show "EH xx" and the Alarm
1 LED will continue to flash.
ALARM 1 - Hysteresis
The number displayed In the "xx" position indicates the value of the hysteresis for alarm 1.
The value is given in percentage of the set-point or alarm level and is variable from zero to 10%.
Press the arrow buttons to set the required value and then Edit button to store the value. The
display will then change to repeat the above sequence for alarm 2; indicated by the alarm 2
LED flashing.
ANALOGUE OUTPUT - Top scale value
NOTE: This is factory set to 0 to 5% as the default for the Z1920C. It may be changed as
required. When the EDIT button is pressed following alarm 2 hysteresis entry, the display will
show "EPxxxx" , where "xxxx" is the oxygen concentration at which the analogue output ( 0 to
5v or 4 to 20mA) is at top scale. Press the up/down arrow keys to scroll the display to show the
required setting. See Specification section for the limits of this value. When the required value
is displayed, press the Edit button to store the value and return to measurement mode.
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INM MTL 130-0175 Rev 4
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