Owner's manual

5. Wiring
An external power supply delivering 10-28 VDC with minimum
current capability of 40 mA DC (per transducer) is required to
power the control loop. See Fig. A for connection of the power
supply, transducer and receiver. The range of appropriate re-
ceiver load resistance (RL) for the DC power supply voltage avail-
able is expressed by the formula:
R
L Max =Vps – 10V
20 mA DC
Shielded cable is recommended for control loop wiring.
Black wire is negative (-) and red wire is positive (+) in Fig. B.
MAINTENANCE
After final installation of the pressure transducer and its compan-
ion receiver, no routine maintenance is required. A periodic check
of system calibration is suggested. The Series PBLTX transduc-
ers are not field repairable and should be returned if repair is
needed (field repair should not be attempted and may void war-
ranty). Be sure to include a brief description of the problem plus
any relevant application notes. Contact customer service to re-
ceive a return goods authorization number before shipping.
CAUTION: Do not exceed specified supply
voltage ratings. Permanent damage not cov-
ered by warranty will result. This device is not
designed for 120 or 240 volt AC operation.
Use only on 10 to 28 VDC.
I
NSTALLATION
1. Location: Select a location where the temperature of the trans-
ducer will be between 0 and 176°F (-18 to 80°C). Distance from
the receiver is limited only by total loop resistance.
2. Position: The transducer is not position sensitive. However all
standard models are originally calibrated with the unit in a posi-
tion with the diaphragm downward. Although they can be used at
other angles, for best accuracy it is recommended that units be
i
nstalled in the position calibrated at the factory.
3. Mounting: The transducer can be mounted via several meth-
ods. It can be suspended from the electrical cable, it can be
placed resting on the bottom of the tank in either horizontal or
vertical orientation, or it can be attached to a pipe or hang wire by
the 1/2˝ NPT male connection on the top of the housing.
4. Wire Length: The maximum length of wire connecting the
transducer and receiver is a function of wire size and receiver re-
sistance. Wiring should not contribute more than 10% of the re-
ceiver resistance to total loop resistance. For extremely long runs
(over 1000 feet), choose receivers with higher resistance to min-
imize the size and cost of connecting leads. Where wiring length
is under 100 feet, wire as small as 22 AWG can be used.
POWER
SUPPLY
10-28 VDC
-
RECEIVER
BLACK
R
ED
PRESSURE
TRANSDUCER
mA
Fig. A
Fig. B
B
LACK (-)
RED (+)