Aalborg DFM Digital - Manual (Page 38)

34
GAS FLOW
26 FlowOutScaleV - DAC 0-5/0-10 Analog Output Scale for Flow
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 - DAC 0-5/0-10 Analog Output Scale for Temperature
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 - DAC 0-5/0-10 Analog Output Scale for Pressure
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 Aalborg
7 supplied calibration and maintenance soft-
ware) and the device has RS-485 address 11. If Aalborg
7 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:
!11,BackDoorEnabled: Y
Disable DAC update by typing: !11,WRITE,4,D[CR]
Unit will respond with: !11,DisableUpdate: D
,