Instruction Manual

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, GV and T2 pressure transduc-
ers are high performance instruments intended for use
in industrial applications where the process media is
compatible with the 17-4PH stainless steel sensor ma-
terial and the 304 SS process connection.
The G3 utilizes 316L SS for both the sensor and pro-
cess connection for use with a process media that
requires all 316 SS wetted parts.
MECHANICAL INSTALLATION
Environmental
The G2, G3, GV 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 dependent 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, G3, GV and T2 transducers require no special
mounting hardware and can be mounted in any orien-
tation 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 vi-
bration. 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
1
⁄16˝) wrench can be used on the wrench
flats of the hex. For G2, G3, GV models with detach-
able electrical connectors a 6 point deep socket can
also be used to install the unit.
Electro-Magnetic Interference
The circuitry of the G2, G3, GV and T2 transducers
is designed to minimize the effect of electromagnetic
and radio frequency interference. To minimize suscep-
tibility 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, G3, GV and T2 transducers are precisely cali-
brated and temperature compensated at the factory to
ensure long and stable performance. There are no field
accessible 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.
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.
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)
10
40
9 (min)
36 (max)
Loop Supply Voltage (Vdc) [LSV]
(4-20mA ONLY)
Loop Resistance (R
L
-Ohms)
1400
1200
Power Supply Voltage vs Loop Resistance
G2, G3, GV & T2 ELECTRICAL INSTALLATION
G2, G3, GV & T2 ELECTRICAL INSTALLATION (cont.)
Wiring Diagrams (see following pages for further
detail)
G2, G3 ELECTRICAL TERMINATIONS AND WIRING
HIRSCHMANN G SERIES
Mates to Optional Hirschmann G4W1F connector, or equal
Pin Voltage 4-20mA Mating
No. Output Output* Cable Color
1 V + V + Red
2 Common V
– Black
3 Output V
– White
4 Case Gnd. Case Gnd. Green
IP67 Ingress rating
AMP SUPERSEAL
Pin Voltage 4-20mA Mating
No. Output Output* Cable Color
1 Common V – Black
2 Output V
– White
3 V + V
+ Red
3
2
1
2 3 4 5
* Use either V- termination on G2 with 4-20mA output
* Use either V- termination on G2 with 4-20mA output
M12 ELECTRICAL TERMINATION
FOR G2, G3 (EW), (EO), (E2), (E1)
Mates to optional Hirschmann connector
Part 933 172-100 or equal
Pin Voltage 4-20mA Mating
No. Output Output* Cable Color
1 V + V + Red
2 Case Grd. Case Grd. Green
3 Common V – Black
4 Output V – White
IP67 Ingress rating
Pin 1
Pin 2
Pin 3
Pin 4
KEY
4-20mA Output
3-Wire Voltage Output