GPI GM001, Руководство пользователя, Страница: 17 / 20

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*
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 ap-
proximately 2.5 mA without degrading conversion accuracy. However, “ac-
tive” 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 possible damage to the unit.
SPECIFICATIONS – REMOTE MODEL
Applications:
Use for indoor or outdoor applications where occasional
moisture is common.
Materials:
Acetal, Amorphous Nylon, Silicone Rubber, Polyester
(decals), Viton (gasket & seals), Stainless Steel (fasteners),
PVC (cable jacket)
Power Source:
2-wire, loop powered
*
. 8.5 VDC to 35 VDC loop voltage
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 maintain 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 cur-
rent 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 calibration),
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:
Display and
Input Type Analog Conversion Digital Output
LLC (sine): approx. 11-1000 Hz approx. 0-1000 Hz
HLLF: 0.25-150 Hz 0-150 Hz
HLHF: 0.25-1200 Hz 0-1200 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 possible 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
20
–f
4
)]. Where f
20
= frequency at 20 mA,
f
4
= frequency at 4 mA.
Speed of Response: After step change in input frequency,
loop output guaranteed stable within 3 x accumulating time
(Accumulating time user selectable 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)