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90DM4 Calibration Procedure
Make sure that the unit has completed its warm up cycle (approximately 15 minutes) before beginning the
calibration.
Connecting the Hardware
1. Plug the calibration adaptor onto the gas sensor inlet.
2. Screw the regulator to the calibration zero gas cylinder and adjust the flow rate to 0.5L/min.
3. Connect the regulator outlet to the calibration adaptor as shown
Adjusting the Zero (units without display)
1. Turn on the regulator.
2. The nitrogen Zero gas is now flowing into the unit.
3. Let the gas flow for a minimum of 10 minutes.
4. Press the left button once and wait for the red LED to begin flashing.
5. Press the left button again to confirm the start of calibration.
6. The red LED will then blink quickly during the entire calibration process.
7. The calibration procedure is finished when the red LED blinks normally.
Adjusting the Zero (units with display)
Access to the 90DM4 programming is achieved through push buttons located on the back of the device,
accessible through an oblong cut-out. The left hand button opens access to programming functions and
validates selections (equivalent to an Enter button). The right hand button scrolls through main programming
screens and increases values when in a specific programming screen.
Hold the unit (facing you) in both hands
Place both index fingers through the cut-out until they touch the left and right push buttons, respectively.
Press the left button to access the programming menus.
1. Turn on the regulator. The nitrogen is now flowing into the unit. Wait for 10 minutes minimum to allow
the reading to stabilize.
2. Press the left pushbutton to access the menu.
3. Use the right pushbutton to change the letters one at a time; when the password VA is displayed
press the left pushbutton to confirm.
90DM4
Calibration Handbook
17L or 103L Calibration Gas Cylinders
41
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