NOSHOK KING-GAGE 5900, Руководство по эксплуатации и калибровке

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page 5
Model 5900 D/P Module EX-1710-1
Pressure Connections
D/P Module Transmitter incorporates two (2) 1/8" NPT
ports for HIGH and LOW differential pressure inputs.
vent plug for atmospheric reference (or low pressure
input when measuring differential pressure)
connection for pressure input signal (high pressure
input when measuring differential pressure)
When application is for psig (gage pressure), the low pressure
port is not used. A vent plug should be installed in the low
pressure port to allow transmitter to reference atmosphere.
The low pressure port should
never be plugged or sealed!
Signal Loop Connections
A plug-in type terminal connector is furnished for the +
Signal and − Signal inputs. Terminal block can be removed
to make the cable connections and then re-inserted into
the mating socket. Screw clamp terminals are provided
for positive (
+ ) and negative or common ( − ) sides of the
signal loop.
As is typical of two-wire transmitters, all electrical power
is supplied through the signal loop wiring. Refer to the
following diagram for proper wiring of the 4–20 mA loop
circuit:
E S
1/8 in NPT
(Optional)
1/4 in Fittings
Low
Pressure
Ports
High
Pressure
Ports
4-20 mA
Output
Connection
+ -
+V
A
V
COM
R
L
KING-
GAGE
ZERO
SP
AN
+
-
D/P
MODULE
4-20 mA
Pressur
e
Transmitter
T
E
S
T
Plug-in Power/Signal
Connector
+ Ð
2 1
4-20 mA
Output
Connection
+ -
+V
A
V
COM
R
L
KING-
GAGE
ZERO
SP
AN
+
-
D/P
MODULE
4-20 mA
Pressur
e
Transmitter
T
E
S
T
Plug-in Power/Signal
Connector
+ Ð
2 1
Power Requirement
The D/P transmitter requires a source of DC power (14– 40
Vdc) for operation. Minimum excitation voltage must be
no less than 14 Vdc Any receiver installed on the signal
loop (meters, data loggers, controllers, etc.) must be taken
into account when determining the required power supply
voltage to be used. The internal resistance of each device
added together represents the total “load” residing on the
signal loop circuit.
Load Capacity = (Supply Voltage − 12 Volts)
(ohms) .02
Load Capacity at Supplied Voltage
KING-GAGE
®
tank processors and LevelBAR provide 24 Vdc
excitation to power the signal loop circuit. (If the application
requirement exceeds 700 ohms, an external power supply
of appropriate voltage will be required.)
Signal Cabling
The 4–20 mA signal loop needs to be run using twisted pair
(two conductor) cable. “Noise” or EMI (electromagnetic
interference) does not generally create a problem since it
is common to both wires in the pair and essentially cancels
itself out. In most applications, non-shielded twisted pair
instrumentation cable (20–22 awg) will be suitable for the
signal loop between the LP2 and sensor/transmitter.
20 Vdc 24 Vdc 28 Vdc 32 Vdc 36 Vdc 40 Vdc
400 ohms 600 ohms 800 ohms 1000 ohms 1200 ohms 1400 ohms
S
E