Kurz Instruments, Inc. 831-646-5911
2411 Garden Road www.kurzinstruments.com
Monterey, CA 93940
454FTB/504FTB/534FTB I/O connections
Power
Most 155 units are available with either 115/230 VAC or 24 VDC depending on which
version you purchased. Both types require a ground wire for product safety compliance.
The MFT B-Series, 454FTB, 504FTB and 534FTB have a universal input power supply,
85 to 265 VAC, 50/60 Hz or 24 VDC (18 to 30 V).
Analog Output
This is an optional feature which can be wired two ways but you still need the 24 VDC
power (or AC power option) to operate the unit as a “4-wire” connection:
1. The 4-20 mA interface can be optically isolated (also known as loop powered). In
this case your 4-20 mA input circuit is providing the excitation voltage.
2. You can self power the 4-20 mA circuit from the flow meter where Kurz
provides
the 24 VDC excitation voltage. The output is not isolated in this case. Here your
4-20 mA input will need a differential current receiver or other method to accept
the current signal which is ground referenced at the flow transmitter.
Digital Communications (also see Protocol section near the end)
155: The 155 flow computers (Jr/A/B/C2/E2) have a fixed 9600 baud rate connection
via a straight though DB-9 connector to a PC. This is for remote terminal
communications.
Analog
Outputs
DC
Power
USB
RS-485
Sensor
DO,
DI, AI
AC
power
360208-D Models 155, 454FTB, 504FTB, 534FTB 11
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