Nivus osm-f, Operation Instruction Manual

Page: 55 / 103

Instruction Manual
OCM F
OCM F - Rev. 04 as of 18.02.2014 Page 55
9.4.4 Parameter Menu „Flow Velocity“
Fig. 9-33 Sensor settings
Sensor type Select between wedge or pipe sensor. The standard setting is wedge sensor.
Mounting height This menu point is to modify the installation height of the flow velocity sensor.
The standard setting is 15 mm (0.59 in) which is equivalent to the position of
the sensor centre above the channel bottom. This setting does not need to be
modified unless the sensor has been installed
higher or lower . If the sensor
has been installed higher enter the additional mounting height plus 15 mm
(0.59 in) and modify parameter “h-crit” (see Chap. 9.6.2) additionally, if in-
stalled lower subtract the missing height from 15 mm (0.59 in) and enter
overall height.
Never countersink flow velocity sensors without pressure measurement cell
deeper than 8 mm into the channel bottom (see "Installation Instruction for
Correlation and Doppler Sensors")!
Never countersink flow velocity sensors with integrated pressure measure-
ment cell into the channel bottom!!!
Otherwise the measurement might fail!
Install. direction Installation direction is set to “positive“ per default. This parameter should not
be modified. It is going to be used only for special applications where the flow
velocity sensor is heading upstream (unlike heading downstream towards the
flow direction as in standard applications) but is to detect positive velocities
however. This is the only case which requires to set “negative“ here.
9.4.5 Parameter Menu „Digital Inputs“
Fig. 9-34 Digital inputs – submenu
Select from digital inputs 1 – 4 using the >left< or >right< arrow keys as long as
the regulator function is active. This section enables to set and the digital input
signals „switch OPEN“, „switch CLOSE“ and „torque switch“.
The OCM F requires these inputs for regulator operation.
The function >Stop v-measurement< is exclusively available for digital input 4.