GPI GM001, Руководство пользователя, Страница: 16 / 20

16
SPECIFICATIONS – LOCAL 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)
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. 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.
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 volt-
age 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 calibration)
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 inaccuracy 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 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).
Frequency Range:
0.25 to 1,000 hertz
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 independent, iso-
lated 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.