Initial Setup - Aalborg DFM 26 Operating Manual

GAS FLOW
26 FlowOutScaleV
27 FlowOutScale_mA - DAC 4-20mA Analog Output Scale for Flow
28 FlowOutOffset_mA - DAC 4-20mA Analog Output Offset for Flow
GAS TEMPERATURE
29 TempOutScaleV
30 TempOutScale_mA - DAC 4-20mA Analog Output Scale for Temperature
31 TempOutOffset_mA - DAC 4-20mA Analog Output Offset for Temperature
GAS PRESSURE
32 PresOutScaleV
33 PresOutScale_mA- DAC 4-20mA Analog Output Scale for Pressure
,
Note: Models DFM 26/36/46 do not support temperature and pressure
measurement and have only one gas flow analog output.

7.3.1 Initial Setup

Power up the Mass Flow Meter for at least 3 minutes prior to commencing the cal-
ibration procedure. Make sure absolutely no flow takes place through the meter.
Establish digital RS-485/RS-232 communication between PC (communication ter-
minal) and DFM. The commands provided below assume that calibration will be
performed manually (w/o Aalborg7 supplied calibration and maintenance soft-
ware) and the device has RS-485 address 11. If Aalborg7 supplied calibration and
maintenance software is used, skip the next section and follow prompts from the
software.
Enter Backdoor mode by typing: !11,MW,1000,1[CR]
Unit will respond with:
Disable DAC update by typing:
Unit will respond with:
- DAC 0-5/0-10 Analog Output Scale for Flow
- DAC 0-5/0-10 Analog Output Scale for Temperature
- DAC 0-5/0-10 Analog Output Scale for Pressure
!11,BackDoorEnabled: Y
!11,WRITE,4,D[CR]
!11,DisableUpdate: D
34