Fluid Components International ST50 - Manual (Page 6)

FLUID COMPONENTS INTERNATIONAL LLC ST50 MASS FLOW
This page is subject to proprietary rights statement on last page 6 Doc. No. 06EN003367 Rev. D
Pulse Output Activation
The ST50 provides a pulse output optional feature. Instruments ordered with this feature and volumetric or mass flow units will be
factory set with totalizer and pulse output activated. The mode can be changed in the field. Wiring either sink or source mode is
shown on page 7.
Source Mode: 15 VDC output, 50 mA max
Sink Mode: 40 VDC Max, 150 mA max. Customer supplied power source
The analog output configuration can be modified using three different methods:
1. The RS232 port, a FC88 hand held terminal and single letter commands as identified in Appendix A, table 5 of the Installation
and Operation Guide. The “V” command specifically configures the instrument analog outputs.
2. The RS232 port, a computer and the CLI commands as identified in Appendix A, table 6 of the Installation and Operation
Guide.
3. The PDA IR communication interface with version 1.11 software.
The ST50 mass flow meter pulse output can be configured for either a pulse train (factory standard) for an external counter and/or
flow rate indication or an alarm. The pulses are available in 2 modes, Source and Sink. The maximum frequency of the pulse output
is 500Hz. The pulse output will only function after setup of the totalizer. After setup of the totalizer the pulse output needs to be
setup. During the pulse setup, the mode needs to be selected as well as the pulse factor, sample period and the pulse state
Source mode: In this mode the flow meter electronics will supply the voltage and current
for the pulse. Maximum 15 Vdc and 50mA (depends on the connected load).
Sink mode: If the connected load requires >15 Vdc and 50mA, an external power supply is required. Maximum 40 Vdc and
150mA
Pulse factor: Number of pulses per selected engineering unit. Default =1
Example in NCMH:
1 = 1 pulse per NCM
0.1 = 1 pulse per 0.1 NCM (10 pulses per 1 NCM)
10 = 1 pulse per 10 NCM
Range pulse factor 0.001 – 1000
Sample time: time in seconds before calculating the next number of pulses.
Pulse state: can be set High to Low or Low to High. Meaning the pulse is normally high or low
Pulse Output Set up
Pulse output functions:
Alarm:
can be set in Source and Sink mode. If this function is selected the state of the NPN open collector will change
from high to low or low to high, depending on the selected pulse state, at a set flow rate. (pulse factor and sample
time not required).
Counter: can be set in Source and Sink mode. The NPN open collector will output the calculated number of pulses* calcu-
lated based on the indicated flow. And external display will indicate the totalized flow.
Flow rate: can be set in Source and Sink mode. The NPN open collector will output the calculated number of pulses* calcu-
lated based on the indicated flow. External display set to calculate flow from incoming pulses.
+vdc
0vdc
+vdc
0vdc
High to Low
Low to High
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