Batch Controller RA33
Commissioning
Hauser
33
Example: flow signal is 4 mA (0 m
3
/h), but the device displays 4.01 mA (0.2 m
3
/h). If you enter
the set point 0 m
3
/h, actual value: 0.2 m
3
/h, the device "learns" a new 4 mA value. The set point
must always be within the measuring range.
Low flow cut off
Volume flows below the configured low flow cut off value are evaluated as zero (not measured on
the counter). This is used to suppress measured values, for example at the lower limit of the mea-
suring range.
For the pulse input, the minimum permitted frequency can be determined from the low flow cut
off. Example: low flow cut off 3.6 m
3
/h (1 l/s), pulse value of the transmitter: 0.1 liter.
1/0.1 = 10 Hz. This means that after 10 seconds, the value "0" is displayed for volume flow and
power.
For analogue signals, two variants of low flow cut off exist:
• Positive flow measuring range, e.g. 0 to 100 m
3
/h: values less than the low flow cut off value are
valued at zero.
• Negative start of measuring range (bidirectional measurement), e.g. -50 to 50 m
3
/h: Values
around the zero point (+/- low flow cut off value) are valued at zero.
Temperature (optional)
To measure the temperature, RTD sensors can be connected directly or via transmitter (4 to 20 mA).
For the direct connection, sensors of types PT 100/500/1000 can be used. Different measuring
ranges for high and low temperature differences can be selected for PT 100 sensors to ensure max-
imum accuracy (
Setup
É
Advanced setup
É
Inputs
É
Temperature
É
Range
).
When using a current signal, the measuring range can be scaled individually (
Setup
É
Advanced
setup
É
Inputs
É
Temperature
).
Refer also to Compensation,
43.
Density (optional)
To measure the density, a density sensor can be connected to the current input marked "Density"
via 0/4 to 20 mA.
Refer also to Compensation,
43.
Digital inputs
Two digital inputs are available: Depending on the options of the device, the following functions can
be controlled via the digital inputs:
Function
Description
Batch active (high)
A batch is started when there is a switch from low->high. It runs until either the value on
the preset counter is reached or the signal drops from high->low. An active batch is
aborted and ended if the signal drops. If the value on the preset counter is reached and a
new batch should start, a switch must first take place from high->low so that another
change from low->high can kickstart the new batch run.
Batch start (edge)
A batch is started when the edge changes from low->high. The function has exactly the
same effect as pressing the button locally.
Batch stop (edge)
A batch is paused when the edge changes from low->high and aborted and then stopped
with the next change from low->high. The function has exactly the same effect as pressing
the button locally.
Reset batch no.
The batch number, which is automatically increased, is reset to the start value specified in
Setup when the edge changes from low->high.
Time synchronization
Time synchronization is triggered by an edge change from low->high.
Status
The device remains operational as long as there is a high signal (status=OK). Once the sig-
nal drops to low, any batching operation that is currently active is stopped and the device is
locked so that it cannot restart. The device remains locked until there is a high signal again,
which indicates that the system is operational.
