Dynasonics TFXM Series Ultrasonic Multi-Channel Flow Meter - Manual (Page 55)

Rev. 8/02
-3. 17- TFXM
labeled 4-20mA IN or 4-20mA OUT, Fig. 1.4).
2. Using the arrow keys, increase the numerical value to in-
crease the current in the loop to 20mA. Decrease the value
to decrease the current in the loop to 20mA. Typical values
range between 3700-3900 counts.
Re connect the 4-20mA output circuitry as required.
4-20 TST - 4-20mA Output Test
4-20
Allows a simulated value to be output from the 4-20mA output.
By incrementing this value, the 4-20mA output will transmit the
indicated current value.
Integral Dual Relay Configuration
RELAY 1 AND RELAY 2
NONE
TOTALIZE
TOT MULT
FLOW
ON
OFF
SIG STR
ERRORS
Two independent SPDT (single -pole, double-throw, Form C)
relays are integrated into the TFXM for each measuring chan-
nel installed within the flow meter enclosure. The relay
operations are user configured via software to act in either a
flow rate alarm, signal strength alarm or totalizer/batching
mode. See Figure 1.4 for terminal block locations. The relays
are rated for 200 Vac max. and have a current rating of 0.5 A
resistive load [175 Vdc @ 0.25 A resistive]. It is highly
recommended that a slave relay be utilized whenever the con-
trol relays are used to control inductive loads such as solenoids
and motors.
PART 3 - KEYPAD CONFIGURATION
4-20mA Test
Relay Setup