Dynasonics TFXM Series Ultrasonic Multi-Channel Flow Meter - Manual (Page 58)

Rev. 8/02
-3. 20- TFXM
ISO-MOD RATE PULSE
FL 100H
FL 10KH
CAL 100H
CAL 10KH
The Rate Pulse Output Module is utilized to transmit informa-
tion to external counters and PID systems via a frequency out-
put that is proportional to system flow rate. Independent Zero
and Span settings are established in software using the Flow
Measuring Range entries. These entries can be set anywhere
in the –40 to +40 FPS [-12 to +12 MPS] measuring range of the
instrument. Output resolution of the module is 12-bits (4096
discrete points) and the maximum output frequency setting is
2,500 Hz. The 0.21-Ohm FET output is rated to operate at 100
V and 1 A maximum. This module does not source an output
voltage and should be treated as an open collector type of out-
put. An external voltage source and limit resistor must be pre-
sent.
The FL 100H and FL FL10KH entries are used to set the span
of the 0-2.5KHz frequency output. These entries are volumet-
ric rate units that are equal to the volumetric units configured
as Engineering Rate Units and Engineering Units Time Interval
entered on page 3.12. These entries may be entered any-
where in the flow measurement range of the instrument
(velocity range of –40 to +40 FPS [-12 to +12 MPS]).
For example, to span the 0-2.5KHz output from –100 GPM to
+100 GPM, with 1.25KHz being 0 GPM, set the FL 100H and
FL 10KH inputs as follows:
FL 100H = -98.0 (1% of span)
FL 10KH = 100.0
For example, to span the Rate Pulse output from 0 GPM to
+100 GPM, with 1.25 kHz being 50 GPM, set the FL 100H and
FL 10KH inputs as follows:
FL 100H = 1.0 (1% of span)
FL 10KH = 100.0
PART 3 - KEYPAD CONFIGURATION
Rate Pulse Span
Optional
Rate Pulse