Detcon DM-600IS - Manual (Page 29)

DM-600IS
DM-600IS Instruction Manual Rev 1.5.9 Page 25 of 37
9.0 Calibration
Material Requirements
 Detcon PN 327-000000-000 MicroSafeTM Programming Magnet
 Detcon PN 943-000006-132 Calibration Adapter
 Span gas containing the target gas in air or nitrogen. The target gas concentration is recommended at
50% of range (which is the factory default) at a controlled flow rate of 500 ml/min. Example: for a
Model DM-600IS-H2S sensor with a range of 0-100ppm, a test gas of 50 ppm is recommended. For a
sensor with a range of 0-10 ppm a test gas of 5 ppm is recommended, etc. Other concentrations can be
used as long as they fall within 10% to 90% of range. See section 9.2 for details. Reference section 10-
2) -b) if you do not know the sensor target gas or range of detection.
9.1 Calibration Procedure - Zero
NOTE: Before performing a zero calibration, be sure there is no background gas present or
apply a zero gas standard prior to performing zero calibration.
a) Enter the calibration menu by holding the programming magnet stationary over “PGM 1” (see figure
6) for 3 seconds until the display reads “1-ZERO 2-SPAN” then withdraw the magnet. Note that the
“CAL” LED is on.
b) Next, enter the zero menu by holding the magnet stationary over “PGM 1” for 3 seconds until the
display reads: “SETTING ZERO”, then withdraw the magnet. The sensor has now entered the auto
zero mode. When it is complete the display will read “ZERO COMPLETE” for 5 seconds and then
return to the normal operations menu reading “(0 PPM)”.
Zero calibration is complete.
9.2 Calibration Procedure - Span
CAUTION: Verification of the correct calibration gas level setting and calibration span gas
concentration is required before “span” calibration. These two numbers must be equal.
Calibration consists of entering the calibration function and following the menu-displayed instructions. The
display will ask for the application of span gas in a specific concentration. This concentration must be equal to
the calibration gas level setting. The factory default setting for span gas concentration is 50% of range. In this
instance, a span gas containing a concentration equal to 50% of range is required. If a span gas containing 50%
of range is not available, other concentrations may be used as long as they fall within 10% to 90% of range.
However, any alternate span gas concentration value must be programmed via the calibration gas level menu
before proceeding with span calibration. Follow the instructions below for span calibration.
a) Verify the current calibration gas level setting as indicated by the programming status menu. To do
this, follow the instructions in section 10 and make note of the setting found in listing number 12. The
item appears as “CalGas @ xxPPM”.
b) If the calibration gas level setting is equal to your calibration span gas concentration, proceed to item
“f”. If not, adjust the calibration gas level setting so that it is equal to your calibration span gas
concentration, as instructed in items “c” through “e”.