Ashcroft T2 - High Performance Pressure Transmitter - Manual (Page 2)

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 1 ⁄
16
˝) wrench can be used on the wrench
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.
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]
P
(4-20mA ONLY)
L
o
o
p
R
e
s
is
ta
n
c
e
(
R
L
-O
h
m
s
)
1400
1200
Power Supply Voltage vs Loop Resistance
G2 & T2 ELECTRICAL INSTALLATION
G2 & T2 ELECTRICAL INSTALLATION (cont.)
Wiring Diagrams (see following pages for further detail)
G2 ELECTRICAL TERMINATIONS AND WIRING
3-PIN DELPHI (PACKARD)
METRI-PACK 150 SERIES
Mates to Optional Metri-Pack connector 12065287
Pin Voltage 4-20mA Mating
No. Output Output* Cable Color
A Common V – Black
B V + V + Red
C Output V – White
IP67 Ingress rating
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
* Use either V- termination on G2 with 4-20mA output