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Gas- and Steam Flowcomputer
DigiFlow 515
Operating Manual
7
Analog Input 4 – 20 mA:
Inputs:
2 for flow (split range), 1 for pressure, and 1 for temperature, for flow correction, or
2 for flow (split range) and 2 for pressure for energy–balance.
Input Impedance:
120
Ω
.
Circuit:
All inputs are isolated, no common ground.
RTD Input:
Range:
-310 to +1472°F.
RTD Type:
Pt100 according to DIN 43760.
Non–Linear Correction:
The non–linearity of the RTD is internally compensated.
Pressure Input:
Type:
Absolute or gauge.
Span:
The pressure at 4mA and 20mA are programmable. Linear interpolation for all other points.
Atmospheric pressure:
If a gauge pressure sensor is used, the atmospheric pressure must be entered.
Pulse Output:
Pulse Width:
Adjustable between 10 ms and 90 ms.
Duty Cycle:
≥
1 : 1.
Logic:
Open Collector, Active Low.
Current sinking:
max. 100 mA.
Pulse generation:
The pulse count is proportional to the counter difference in selectable units of 10 (1, 10, 100,
....100000).
External Keyboard:
Function:
One input controls the display and one input resets the total-counters.
Circuit:
An input voltage higher than +18 V is detected.
Communication Port:
Type:
An RS232 interface is provided. Optionally there is a RS485 multipoint communication interface
for up to 32 instruments connected to a common bus.
Baud Rate:
300 – 9600 Baud.
Data Bits:
7 or 8 selectable.
Parity:
None, even or odd.
Stop Bits:
1 or 2 selectable.
Data logging:
Output in intervals up to 9999 min or by key stroke.
Relay Output:
Function:
High– and Low–flow rate alarms based on the flow rate, mass, corrected volume, or energy.
Form:
Normally open. (SPST)
Max. Voltage
250 V AC
Max. Current
6 A AC
Summary of Contents for digiflow 515
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