GPI GM Serie Guía De Operación página 17

SPECIFICATIONS – REMOTE MODEL
Applications:
Use for indoor or outdoor applications where occa-
sional moisture is common.
Materials:
Acetal, Amorphous Nylon, Silicone Rubber, Polyes-
ter (decals), FKM (gasket & seals), Stainless Steel
(fasteners), PVC (cable jacket)
Power Source:
*
2-wire, loop powered . 8.5 VDC to 35 VDC loop volt-
age required for correct operation.
**
Outputs :
Analog Primary: 4-20 mA current loop. (This is also
the power supply input for the module.) With loop
voltage maintained within specified limits, will main-
tain advertised linearity over 4 mA to 20 mA range,
with good linearity in over-range conditions to about
1.5 mA and 25 mA. Absolute maximum current limit
under fault conditions approximately 35 mA.
Analog Auxiliary: 0 to 5 VDC. Relationship to primary
current output: V(volts) = l (ma) ÷ 5 . Will maintain
advertised linearity over 0.8 V to 4.0 V range, with
good linearity in over-range conditions to about 0.1 V
and 4.9 V. Recommended minimum driven impedance
= 10K Ohms.
Digital (Pulse Out): Open Collector, square wave. Will
switch up to 60 V and up to 200 mA. Closed circuit
voltage drop typically 0.1 V; guaranteed less than
0.5 V at any in range current.
Configuration:
2-Totals (1 Cumulative and 1 Batch), Rate, 2 Cals
(Factory calibration in gallons or litres; 1 field calibra-
tion), K-factor to match published K-factor for each
size meter.
Time Base:
Hours or minutes
Unit of Measure:
U.S. gallons or litres
Frequency Limits for Correct Operation:
Input Type Analog Conversion
LLC (sine): approx. 11-1000 Hz
HLLF: 0.25-150 Hz
HLHF: 0.25-1200 Hz
Optically Isolated HLLF: same as standard HLLF
Optically Isolated HLHF: same as standard HLHF
Accuracy / Performance:
Max. Conversion Error: (nonlinearity plus span, any
input, loop current output, 0° C to 70° C, loop voltage
supply 12 VDC to 24 VDC) 0.5% of span plus pos-
sible resolution uncertainty. Coupled flowmeter may
add additional error.
Max. Conversion Resolution Uncertainty: (Loop
current output, when properly calibrated) Larger of
0.1 mA or [20 mA / (10 x ( f
quency at 20 mA, f = frequency at 4 mA.
4
Display and
Digital Output
approx. 0-1000 Hz
0-150 Hz
0-1200 Hz
–f )]. Where f = fre-
20 4 20
Speed of Response: After step change in input
frequency, loop output guaranteed stable within 3 x
accumulating time (Accumulating time user select-
able from 0.3 sec, 0.7 sec, 1.3 sec, 2.6 sec, 5.2 sec).
Batch Total:
Up to 999,999 (x100)
Cumulative Total:
Up to 999,999 (x100)
Ambient Temperature:
+32° F to +140° F (0° C to +60° C)
Cable:
20 feet, 3-conductor (red, black & white), tinned drain
wire, 22 AWG, PVC jacket .212 dia., (Reference
Belden 9363 or equivalent cable).
Mechanical Connections:
Wall or pipe mountable with standard U-bolts.
Electrical Connections:
GX500 - Two strain relief ports
GX510 - One strain relief port: one threaded plug
G2 Series - Two strain relief ports
GM Local Models - Two strain relief ports
GM 1/2 in. and Larger - One strain relief port: one
threaded plug.
Shipping Weight:
1.1 lb. (.5 kg)
*
To power some low power pickup/display devices, such as a GPI
"EDM" module, a loop powered GX500 can supply 5 VDC at up
to approximately 2.5 mA without degrading conversion accuracy.
However, "active" pickup devices or conditioners (i.e., Hall Effect or
R-F) usually require more current. If such a device is used, or if you
use the optically isolated inputs, you must provide an independent,
isolated DC power supply to operate the pickup circuitry.
**
If you want to use the 4-20 mA output and one or both of the
other outputs at the same time, you must provide electrical isolation
between the current loop and all other circuit elements. Failure to
do so will result in incorrect 4-20 mA signal conversion, and pos-
sible damage to the unit.
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