Detcon DM-700 - Manual (Page 25)

Model DM-700
DM-700 Instruction Manual Rev. 4.0 Page 21 of 48
3.5.2 Set AutoSpan Level
Set AutoSpan Level is used to set the span gas concentration level that is being used to calibrate the sensor.
This level is adjustable from 1% to approximately 75% or 95% dependent on full-scale range. The current
setting can be viewed in View Program Status.
The menu item appears as: “Set AutoSpan Level”
From the Set AutoSpan Level text scroll, hold the magnet over PGM1 or PGM2 until the “ ” prompt appears
and continue to hold the magnet in place for an additional 3-4 seconds (until the display starts to scroll “Set
Level”).
The display will switch to “ XX“ (where XX is the current gas level). Swipe the magnet
momentarily over PGM2 to increase or PGM1 to decrease the AutoSpan Level until the correct level is
displayed. When the correct level is achieved, hold the magnet over PGM1 or PGM2 for 3-4 seconds to
accept the new value. The display will scroll “Level Saved”, and revert to “Set AutoSpan Level” text scroll.
Move to another menu item by executing a momentary hold, or return to Normal Operation via automatic
timeout of about 15 seconds (the display will scroll “Set AutoSpan Level” 4 times and then return to Normal
Operation).
3.5.3 Set Serial ID
Detcon Model DM-700 sensors can be polled serially via RS-485 Modbus™ RTU. Refer to Section 4.0 for
details on using the Modbus™ output feature.
Set Serial ID is used to set the Modbus™ serial ID address. It is adjustable from 01 to 256 in hexadecimal
format (01-FF hex). The current serial ID can be viewed in View Sensor Status using the instruction given in
Section 3.5.1 View Sensor Status.
The menu item appears as: “Set Serial ID”.
From the “Set Serial ID” text scroll, hold the programming magnet over PGM1 or PGM2 until the “ ” prompt
appears and continue to hold the magnet in place for an additional 3-4 seconds (until the display starts to scroll
“Set ID”). The display will then switch to “ XX“ (where XX is the current ID address). Swipe the magnet
momentarily over PGM2 to increase or PGM1 to decrease the hexadecimal number until the desired ID is
displayed. Hold the magnet over PGM1 or PGM2 for 3-4 seconds to accept the new value. The display will
scroll “ID Saved”, and revert to “Set Serial ID” text scroll.
Move to another menu item by executing a momentary hold, or, return to Normal Operation via automatic
timeout of about 15 seconds (the display will scroll “Set Serial ID” 5 times and then return to Normal
Operation).
3.5.4 Set Range
The full-scale range of a DM-700 sensor is determined at the time of order. The Intelligent Plug-in Sensor is
factory calibrated for this range. However, if the application requirements change and the user needs to alter
the original range, the “Set Range” function can be used to make field adjustments.
The currently selected full-scale range is displayed in the “View Sensor Status” menu. The factory calibrated
full-scale range is printed on the Intelligent Plug-in Sensor Label. When a new range is selected the 4-20mA
and Modbus™ outputs will automatically be rescaled, and the span gas level will default to 50% of the new
range.
The menu item appears as: “Set Range”