Dwyer SBLTX - Manual (Page 2)

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.
INSTALLATION
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 position
with the pressure connection downward. Although they can be
used at other an gles, for best accuracy it is recommended that
units be installed 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 ver-
tical 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. Electrical Connections
Wire Length - The maximum length of wire connecting the trans-
ducer and receiver is a function of wire size and receiver resist-
ance. Wiring should not contribute more than 10% of the receiver
resistance to total loop resistance. For extremely long runs (over
1000 feet), choose receivers with higher resistance to minimize
the size and cost of connecting leads. Where wiring length is
under 100 feet, wire as small as 22 AWG can be used.
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 receiver
load resistance (RL) for the DC power supply voltage available is
expressed by the formula:
RL Max = Vps – 10V
20 mA DC
Shielded cable is recommended for control loop wiring.
Black wire is negative (-) and red wire is positive (+).
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 SBLTX transducer
are not field repairable and should be returned if repair is needed
(field repair should not be attempted and may void warranty). Be
sure to include a brief description of the problem plus any relevant
application notes. Contact customer service to receive a return
goods authorization number before shipping.
POWER
SUPPLY
10-28 VDC
- RECEIVER
BLACK
RED
PRESSURE
TRANSDUCER mA
Fig. A
Fig. B
Project7:Layout 7 12/7/09 1:10 PM Page 1