Ashcroft G2 Інструкція з експлуатації - Сторінка 2

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3. STATIC ELECTRICAL CHARGES:

Any electrical device may be susceptible to damage

when exposed to static electrical charges. To avoid

damage to the transducer observe the following:

• Ground the body of the transducer BEFORE mak-

ing any electrical connections.

• When disconnecting, remove the ground LAST!

Note: The shield and drain wire in the cable (if sup-

plied) is not connected to the transducer body, and is

not a suitable ground.

DESCRIPTION

The Ashcroft Model G2 and T2 pressure transducers

are high performance instruments intended for use in

industrial applications where the process media is com-

patible with the 17-4PH stainless steel sensor material

and the 304 SS process connection.

MECHANICAL INSTALLATION

Environmental

The G2 and T2 transducers can be stored and used

within the temperature limits of –40°C to 125°C (-40°F

to 257°F). Ingress protection ratings of the units are de-

pendent on the electrical termination specified. Refer to

the wiring diagrams on the reverse for the IP rating of

the unit which is being installed.

Mounting

The G2 and T2 transducers require no special mount-

ing hardware and can be mounted in any orientation

with negligible position error. Although the units can

withstand considerable vibration without damage or

significant output effects, it is always good practice to

mount the transducer where there is minimum vibra-

tion. For units with NPT type pressure fittings apply

sealing tape or an equivalent sealant to the threads

before installing. When instal-ling or removing the unit

apply a wrench to the hex wrench flats, located above

the pressure fitting.

DO NOT tighten by using a pipe wrench on the hous-

ing. A 27mm (1

⁄

˝) wrench can be used on the wrench

1 6

flats of the hex. For G2 models with detachable electri-

cal connectors a 6 point deep socket can also be used

to install the unit.

Electro-Magnetic Interference

The circuitry of the G2 and T2 transducers is designed

to minimize the effect of electromagnetic and radio fre-

quency interference. To minimize susceptibility to noise,

avoid running the termination wiring in a conduit which

contains high current AC power cables. Where possible

avoid running the termination wiring near inductive

equipment.

Field Adjustments

The G2 and T2 transducers are precisely calibrated

and temperature compensated at the factory to ensure

long and stable performance. There are no field acces-

sible adjustments on the G2 or T2 transducers.

ELECTRICAL INSTALLATION

Please refer to the reverse of this page for power sup-

ply requirements and for appropriate wiring protocol

based on the particular output signal and electrical

terminal.

G2 & T2 ELECTRICAL INSTALLATION

Wiring Diagrams (see following pages for further detail)

G2 & T2 ELECTRICAL INSTALLATION (cont.)

Power Supply Requirements:

Output Signal

Min Supply Max Supply

Ratiometric*

4.5Vdc

5.5Vdc

(0.5V to 4.5V)

0-5Vdc

9Vdc

36Vdc

1-5Vdc

9Vdc

36Vdc

1-6Vdc

9Vdc

36Vdc

0-10V

14Vdc

36Vdc

0.5-4.5Vdc

9Vdc

36Vdc

4-20mA**

9Vdc

36Vdc

*0.5Vdc-4.5Vdc output is ratiometric to the

nominal 5Vdc supply

**For transmitters with 4-20mA output signal,

the minimum voltage at the terminals is

9Vdc. However, the minimum supply voltage

should be calculated using the adjacent

graph and formula.

Power Supply Voltage vs Loop Resistance

(4-20mA ONLY)

1400

1200

9 (min)

36 (max)

Loop Supply Voltage (Vdc) [LSV]

To determine minimum loop supply voltage:

LSV(min)=9(V)+[.022(A)*R L ]

Where:

LSV= Loop Supply Voltage (Vdc)

R L = R S + R W (ohms)

R L = Loop Resistance (ohms)

R S = Sense Resistance (ohms) [Measuring Instrument]

R W = Wiring Resistance (ohms)

G2 ELECTRICAL TERMINATIONS AND WIRING

3-PIN DELPHI (PACKARD)

METRI-PACK 150 SERIES

Mates to Optional Metri-Pack connector 12065287

Voltage

4-20mA

Mating

No.

Output

Output*

Cable Color

Common

Black

–

V +

Red

Output

White

–

IP67 Ingress rating

* Use either V- termination on G2 with 4-20mA output

HIRSCHMANN G SERIES

Mates to Optional Hirschmann G4W1F connector, or equal

Voltage

4-20mA

Mating

No.

Output

Output*

Cable Color

V +

Red

Common

–

Black

Output

White

–

Case Gnd.

Green

IP67 Ingress rating

* Use either V- termination on G2 with 4-20mA output

AMP SUPERSEAL

Voltage

4-20mA

Mating

No.

Output

Output*

Cable Color

Common

–

Black

Output

–

White

V +

Red

* Use either V- termination on G2 with 4-20mA output