Seametrics iMAG 4700r User Manual

IMAG 4700r INSTRUCTIONS
Seametrics • 253.872.0284 Page 18 seametrics.com
CONFIGURATION
Cable Shield. In general, the cable shield and its bare drain
wire should be left unconnected at the user equipment end of
the cable to minimize “ground loop” problems.
Pulse Output Conguration. A pulse output is standard
on all models. Since this is an isolated output, the external
equipment must include a DC power source to regenerate the
pulse from the open-collector output (transistor equivalent
of a contact closure). A pull-up or pull-down resistor may
be needed if not included in the user equipment as shown
in the diagrams. Both the power source and resistor may be
supplied internally in some types of control and monitoring
devices. If not, as for most PLC discrete input modules, they
must be added externally at the module input terminals. The
pulse output rate in volume units/pulse can be set by the user
via the SETP tab on the meter’s setup menus.
Because the pulse output of an iMAG 4700 meter is set by
the user, care must be taken to assure the output pulses
do not exceed the maximum frequency of the meter while
also ensuring a reasonable resolution. The iMAG 4700 has a
maximum pulse output of 200 Mz.
K-factor: Remember that SETP is expressed in units totaled
per output pulse (G/P if using gallons) while K-factors are
expressed in pulses per gallon (P/G.) To determine K-factor
from SETP, divide 1 by SETP (if SETP is expressed in gallons.)
Conversely, 1 divided by the K-factor equals SETP
Because all pulse outputs (SETP) are congured in (rate) units
totaled per pulse, all sizes of meters can be congured with
the same SETP values
For example, if your rate is chosen as gallons per minute
(GPM) the table below applies. If your rate is dierent, simply
use your rate label in place of (GPM.) The numerical values will
remain the same.
Pulse Units. The units of measure of SETP are independently
selectable and are not tied to rate or total. Upon change of the
SETP unit, the pulse output may take up to 10 seconds, or the
duration of one pulse (whichever is longer) to take eect.
If Pulse Output is Inconsistent. The PDAMP lter may need
to be increased.
Pulse Width Timing. The unit and value of SETP must be
chosen to keep the duration between meter pulse outputs to
less than 500 seconds.
SETP
Flow Rate at 1
Hz (GPM)
Flow Rate at
200 Hz (GPM)
PoweredMeters
Flow Rate at
150 Hz (GPM)
BatteryPowered
Meters
0.1 6 1200 900
0.2 12 2400 1800
0.3 18 3600 2700
0.4 24 4800 3600
0.5 30 6000 4500
0.6 36 7200 5400
0.7 42 8400 6300
0.8 48 9600 7200
0.9 54 10800 8100
1.0 60 12000 9000
Lowerfrequencyoutputpulses(1pulseforsomeparticular
numberofgallons)canalsobeset.
Any output frequency can be determined by:
Rate (units/minute) ÷ SETP (units/pulse) = pulse/minute
Hz = pulse/minute ÷ 60 seconds / minutes

Seametrics iMAG 4700r Specifications

General

Brand	Seametrics
Model	iMAG 4700r
Category	Measuring Instruments
Language	English