Instruction Manual

Page 19 of 26 M2240 R0
both 0-5 V and 4-20 mA, and the percent of hydrogen
being detected.
Note: before proceeding with this function, first
select the appropriate Analog Output Configuration
Mode.
• Press the Enter button while “Analog Full Scale” is
displayed.
• Specify the hydrogen concentration represented by both
the maximum voltage from the 0-5 V Analog Output and
the maximum current from the 4-20 mA Analog Output
(Default, 2% hydrogen). The minimum voltage and
current value is factory set to represent 0% hydrogen,
and is not configurable.
• For example, using the second “0-5 Volt Config”
format of “0.5-4.5 Volt Mode”, the operator chooses to
designate the maximum voltage output, 4.5 V, to
indicate 4% hydrogen in air. This results in 4.5 V =
4% hydrogen, 0.5 V= 0% hydrogen, and 2.5 V = 2%
hydrogen.
• For example, using the 4-20 mA Analog Output, the
operator chooses 20 mA to indicate 10% hydrogen in
air. This results in 20 mA = 10% hydrogen, 4 mA =
0% hydrogen, and 12 mA = 5% hydrogen.
• Use the Scroll buttons to increase or decrease the percent
value. Use the Mode button to change the digit affected
by the scroll buttons.
• Press the Enter key to set the displayed number into
memory and return to the Configuration Mode.
• Backlight – Controls how the LCD backlight operates.
• Press the Enter button while "Backlight" is displayed.
• Select one of three options:
• Always Off
• Always On
Page 20 of 26 M2240 R0
• On With Change - Under this option, the backlight
illuminates for 15 seconds when any button is
pushed, or on any Alarm. It also illuminates
continuously in configuration mode.
• Press the Enter button to select the option.
• Press the Mode button to exit without making any
change.
• Rev X.xx – The controller firmware revision level is
displayed.