Dynasonics TFXL Clamp-On Ultrasonic Flow User Manual download pdf (Page 17)

06-TTM-UM-00158 8/2012 17

200

100

300

400

500

600

700

800

900

1000

1100

10 12 14 16 18 20 22 24 26 28

Supply Voltage (VDC)

Loop Load (Ohms)

Operate in the

Shaded Regions

Supply Voltage - 7 VDC

0.02

= Maximum Loop Resistance

FIGURE 3.1  ALLOWABLE LOOP RESISTANCE

4-20 mA Return (-)

4-20 mA Output (+)

4-20 mA Ground

4-20 mA Output

FIGURE 3.2  420 MA OUTPUT

The 4-20 mA output signal is available between the 4-20 mA

Out and Signal Gnd terminals as shown in Figure 3.2.

BATCH/TOTALIZER OUTPUT FOR TFXL

Totalizer mode con gures the output to send a 33 mSec

pulse each time the display totalizer increments divided by

the TOT MULT. The TOT MULT value must be a whole, posi-

tive, numerical value.

For example, if the totalizer exponent (TOTL E) is set to E0

(×1) and the totalizer multiplier (TOT MULT) is set to 1, then

the output will pulse each time the totalizer increments one

count, or each single, whole measurement unit totalized.

If the totalizer exponent (TOTL E) is set to E2 (×100) and the

totalizer multiplier (TOT MULT) is set to 1, then the control

output will pulse each time the display totalizer increments

or once per 100 measurement units totalized.

If the totalizer exponent (TOTL E) is set to E0 (×1) and

the totalizer multiplier (TOT MULT) is set to 2, the control

output will pulse once for every two counts that the totalizer

increments.

TOTALIZER OUTPUT OPTION FOR TFXL

TFXL units can be ordered with a totalizer pulse output op-

tion. This option is installed in the position where the rate

pulse would normally be installed.

OPTIONAL TOTALIZING PULSE SPECIFICATIONS

OPTIONAL TFXL TOTALIZING PULSE OUTPUT

Signal

1 pulse for each increment of the totalizers least

signi cant digit.

Operation

Normal state - high; pulses low with display total

increments

Pulse

Duration

30mSec minute

Source/

sink

2 mA maximum

Logic

5 VDC

Wiring and con guration of this option is similar to the total-

izing pulse output for the TFXL variation. This option must

use an external current limiting resistor.

TTL Pluse (+)

TTL Pluse (-)

TTL Pluse (+)

TTL Pluse (-)

FIGURE 3.3  TFXL TOTALIZER OUTPUT OPTION

FREQUENCY OUTPUT

The frequency output is a TTL circuit that outputs a pulse

waveform that varies proportionally with  ow rate. This type

of frequency output is also know as a “Rate Pulse” output. The

output spans from 0 Hz, normally at zero  ow rate to 1,000

Hz at full  ow rate (con guration of the MAX RATE param-

eter is described in detail in the  ow meter con guration

section of this manual).

Turbine Simulation

Turbine Output

FIGURE 3.4  FREQUENCY OUTPUT SWITCH SETTINGS

The frequency output is proportional to the maximum  ow

rate entered into the meter. The maximum output frequency

is 1,000 Hz.

If, for example, the MAX RATE parameter was set to 400 GPM

then an output frequency of 500 Hz (half of the full scale

frequency of 1,000 Hz) would represent 200 GPM.

In addition to the control outputs, the frequency output can

be used to provide total information by use of a “K-factor”.

A K-factor simply relates the number of pulses from the

frequency output to the number of accumulated pulses that

equates to a speci c volume.

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Dynasonics TFXL Clamp-On Ultrasonic Flow User Manual Page 17

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