Ashcroft GC51 - Industrial Rangeable Pressure Transmitter - Manual (Page 3)

Quick Start Function Summary Instructions
for ASHCROFT
® GC51 Version 6.03
(See Complete I&M Manual for Further Detail)
© 2008 Ashcroft Inc., 250 East Main St., Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0499, www.ashcroft.com
All sales subject to standard terms and conditions of sale. 02/11 I&M011-10163_GC51_Rev. C_Ver. 6.03
4. Wiring
Power supply requirements, 12-36Vdc, note installation
recommendations as follows:
Terminal Strip:
SMKDSP1.5/2-5.08 Phoenix contact
A. Cable Requirements
• Two core shielded cable
• Cable outer diameter: 0.35˝ to 0.47˝ (9-12mm)
Required for proper installation with cable gland option
• Wire Gauge: 14-22 AWG (multi-strand or solid)
B. Wiring Instructions
• Do not run pressure transmitter cable / wires within the same
conduit as high voltage (line power) line to reduce the
potential for noise (interference). Use dedicated conduit on
GC51 cables / wires for optimum results.
• Cable diameter, specified above, must be maintained when
using the Cable Gland termination to retain environmental
ratings.
• When connecting shield / drain wire, only connect one end
which should be at the received ground.
• Wire stripping instructions; remove cable jacket 2-3˝ and
strip wires 0.25˝. Shield / drain wire should not be exposed
at the pressure transmitter termination.
• Remove cover and carefully remove the display to access
the terminal strip, take care not to mishandle the display and
associated electronics.
• Turn display over to expose terminal strip, make positive and
negative connections; insert wire equal to the recommended
strip length (0.25˝).
• After completing connections, align the retaining clips of the
display with the housing’s notches and carefully place into
the housing. Be sure that the internal sensor ribbon cable
does not cross the power supply lines just installed.
• Be sure to properly tighten the sealing grommet when using
the Cable Gland before applying tension to the cable; the
cable gland provides strain relief and environmental sealing.
• Tighten GC51 cover to maintain environmental rating.
• Connect to power source and receiver, than apply power to
confirm correct wiring.
• Power Supply Requirements: Although the 4-20mA signal
can travel over long distances, a very common issue to arise
involves inadequate power at the pressure transmitter – this
results in voltage drop across the loop. Be sure to review the
accompanying table to determine whether the 12-36Vdc has
been received at the pressure transmitter.
CASE
DISPLAY
CAP
Inside sensor Line
LCD holder
Notch
Transmission cable
(Twist)
Sheath
＋
−
Terminal box
Display (board)
Shield
Power source
＋ −
Receiver
Transmission cable
Display
Wire terminals
Wire
Turn with a screwdriver
LCD clips (4)
Display board
Power supply
terminal block
1000
750
500
250
0
0 32 20 10
1020
30
Load Limitations 4-20mA Output Only
12 24
545
OPERATING
REGION
Loop Resistance ( ⍀)
LOOP SUPPLY VOLTAGE
V min = 12V+[.022A*R L )]
*Includes a 10% safety factor
R L = R S + R W
R L = Loop Resistance (ohms)
R S = Sense Resistance (ohms)
R W = Wire Resistance (ohms)
LOOP SUPPLY VOLTAGE
I&M011-10163-GC51 QS Rev. c:GC51–Quick Start 2/11/11 3:38 PM Page 3