Contrec 515 FA01, Operation Manual

Page: 54 / 98

Instrument Calibration
44 515 FA01 - 29 August 2021
Output Pulse Factor
Increasing the output pulse width reduces the maximum frequency at which
a total variable can be retransmitted. Pulses will be missed if the output
cannot “keep up” with the rate of total counts. You can use the output pulse
factor to ensure that this maximum is not reached.
The maximum pulse output frequency is determined by:
The minimum pulse factor required is determined by:
For example: To calculate the required pulse factor to avoid losing counts
in retransmission if a total counts at a maximum rate of 75 units/sec (Hz) and
the required pulse width of a remote counter is at least 50 ms:
The maximum pulse output frequency is:
The minimum pulse factor for that frequency is:
PT-MIN OUT
n
PT-MAX OUT
n
The Output Minimum Point and Maximum Point are available for
viewing and editing only when the assigned variable is a rate (4-20 mA
output) type.
The output minimum value corresponds to the 4 mA point and the output
maximum value corresponds to the 20 mA point.
Setting the output range differently from the input range enables the
instrument to amplify the input signal. You can drive a chart recorder that
“zooms in” on a specified range of values instead of displaying the full
operating range of the transducer.
For example, if “volume flow” is chosen as an output variable and
engineering unit is cubic metres per minute, then setting the minimum
point to 30 and the maximum point to 100 would reflect the volumetric
flow rate range of 30 to 100 m
3
/min. At rates above the maximum and
below the minimum points, the output remains at 20 mA and 4 mA
respectively.
 
UNITS PARAMS INPUTS
OUTPUTS
ALARMS COMMS TM/LOG SETUP TEST END
SET
1000
2 pulse width in ms
  
--------------------------------------------------------Hz
max rate of total
max pulse output frequency
------------------------------------------------------------------
1000
2 50

--------------- 10Hz =
75
10
------ 7.5 =