Dynasonics TFXP Series Transit Time Ultrasonic Flow Meter - Manual (Page 15)

Rev. 5/09 -1.13- TFXP
NOTE: The TFXP will automatically enter a low power consumption
mode approximately 1-1/2 minutes after the LOW BATTERY
indicator illuminates. This circuit prevents excessive discharge of
the internal battery.
• If the TFXP is stored for prolonged periods of time, monthly
charging is recommended.
• If the TFXP is stored for prolonged periods of time, store at a
temperature below 70 ºF (21 ºC).
Use wiring practices that conform to local codes (National Electric
Code
®
Handbook in the USA). Use only the power converters that
have been supplied with the TFXP flow meter. The ground terminal,
if present on the converter, is mandatory for safe operation.
CAUTION: Any other wiring method may be unsafe or cause
improper operation of the instrument.
It is recommended not to run line power with other signal wires
within the same wiring tray or conduit.
NOTE: This instrument requires clean electrical line power. Do not
operate this unit on circuits with noisy components (i.e. fluorescent
lights, relays, compressors, variable frequency drives, etc.)
The TFXP can be operated from a 11-15 VDC source, using the
included auto-style power cord, as long as it is capable of supplying
at least 3 watts – observe proper polarity.
The TFXP flow meter may contain two Isolated Input/Output
Modules (ISO-MODs); one located inside of the flow meter
enclosure and one for the optional data logger, located under the
access door on the keyboard. The standard configuration of these
modules is to have the internal module configured as an actively
powered 4-20 mA module and the optional user accessible one as
a data logger.
ISO-MODs are epoxy encapsulated electronic input/output modules
that are simple to install and replace in the field. All modules are
2,500 volt optically isolated from TFXP power and earth grounds –
eliminating the potential for ground loops and reducing the chance
of severe damage in the event of an electrical surge.
PART 1 - TFXP TRANSMITTER CONNECTIONS
General
Information
Regarding
Input/Output:
ISO-MODs