GPI GM Serie Guía De Operación página 16

SPECIFICATIONS – LOCAL 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)
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. With loop volt-
age 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.
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 imped-
ance = 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 current up to 200 mA.
Configuration:
2-Totals (1 Cumulative and 1 Batch), Rate, 2 Cals
(Factory calibration in gallons or litres; 1 field calibra-
tion)
Input Signal:
Hall Effect, Reed Switch, NPN, Open Collector or
Sine Wave
Time Base:
Hours or minutes
Unit of Measure:
U.S. gallons or litres
Accuracy / Performance:
Possible conversion error, in addition to any inac-
curacy of coupled flowmeter, as follows:
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.
Max. Conversion Resolution Uncertainty: (Loop cur-
rent output, when properly calibrated) Larger of 0.1
mA or [20 mA / (10 x ( f
at 20 mA, f = frequency at 4 mA.
4
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).
Frequency Range:
0.25 to 1,000 hertz
16
–f )]. Where f = frequency
20 4 20
Batch Total:
Up to 999,999 (x100)
Cumulative Total:
Up to 999,999 (x100)
Temperature:
Ambient Temperature: +32° F to 140° F (0° C to 60° C)
Cable:
No cable provided.
Mechanical Connections:
Display is mounted directly to flow meter body.
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)
*
Models utilizing Reed Switch pickup are completely loop powered,
and do not require any additional power supply. Note, however, that
models utilizing Hall Effect signal pickup require an additional inde-
pendent, isolated DC power supply for powering the Hall Effect device.
**
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.