electronic option M0/N0/O0/P0
electronic option M0/N0/O0/P0 K07/0422 page 7
The flow computer is installed together with, and pre-wired to, a DOG-… transmitter in a control
box. A connector rail with all required inputs and outputs is provided for the user. The rail’s
connection layout is displayed on the switch box’s safety cover. Electric wiring must be done in
accordance with the wiring diagram following in chapter 4.
The flow computer is preconfigured by the factory. The table containing the factory settings can
be found in annexure D.
The measuring range and the K-factor are pre-set according to client requirements. Linearization
is switched off. The linearization settings should not be altered.
The analogue output (4-20mA) is also factory-calibrated. Please do not change the settings in
menu points 95 and 96, as the calibration points will otherwise be altered.
The pulse output is scaled according to the volume quantity (for example, one pulse every 12m3).
The factory setting is one pulse per m3. The pulse duration can be adjusted between 0.001 and
9.999 seconds. The standard setting is 0.010 seconds.
Volume flow normalization is not active upon delivery of the flow computer and it is unable to
display normalized volume flow without temperature and pressure sensors.
If you wish to measure norm volume flow it is essential that you connect a pressure sensor (4-
20mA) and a temperature sensor (2 or 3-wire PT100). These are not included in the scope of
delivery.
1.3 Commissioning instructions
Before the DOG-… device is used with a flow computer the operator must adjust several
parameters.
1. If you make use of 2-wire temperature sensors you must set “NUMBER WIRES” in menu point 61
to 2.
2. Adjust the measuring range of the analogue pressure sensor used in menu points 72 and 73. The
factory setting for the measuring range is 2.5 bar.
3. If you make use of an absolute pressure sensor the input value for OFFSET in menu point 74
must be set to 0.000 bar.
4. If you enter the standard values in menu 82, 83, 84 and 85, the formula for conversion to the
norm volume flow is activated. It is not essential that the unit be changed from m3/h to the
standardised unit Nm3/h. It has no effect on the calculation of the norm volume flow.
5. You can deactivate the compressibility factor if you set one value in menu points 84 or 85 to zero.
If you wish to deactivate normalization completely you must set all norm values (menu points 82,
83, 84, and 85) to zero.
2. OPERATIONAL
2.1. GENERAL
The flow computer may only be operated by personnel who are authorized and trained by
the operator of the facility. All instructions in this manual are to be observed.
Take careful notice of the "Safety rules, instructions and precautionary measures" in the
front of this manual.
This chapter describes the daily use of the flow computer. This instruction is meant for users /
operators.
