11984 Rev01 Page 6 of 15
3.1 Installation
To ease installation from a pre-plumbed Nitrogen line, a braided flexible gas line is
supplied to connect from the existing plumbing to the nitrogen inlet on the
SENTRY 1510. A regulator and shut-off valve should be placed in the house
nitrogen line, upstream of the SENTRY 1510, so that the nitrogen supply can be
regulated and turned off for maintenance. To connect the facility nitrogen, firmly
insert the nitrogen supply line into the Swagelok fitting. Finger tighten the
Swagelok fitting in a clockwise direction. Tighten the nut 1¼ turns to engage the
internal compression fitting forming a pressure tight fit.
Cable Connection from the Supervisor to the SENTRY 1510
I - Caution: Prior to installing or removing SENTRY 1510 system cabling, make
sure the Supervisor power switch is in the OFF state (see Figure 3-5).
Install the cable from the Supervisor to the cable connection on the SENTRY 1510.
(See Figure 3-3). The Supervisor has three electrical interfaces with the SENTRY
1510. The first interface is the 6 wire stepper motor interface. The stepper motor
used in the SENTRY 1510 is a 4 phase design. One wire is required for each
phase, and two 12 volt DC lines are required. The second interface is the 3 wire
shielded process differential pressure transducer interface. The transducer is
housed in the SENTRY 1510 chassis. This interface provides one wire each for
DC power, ground and a 0-5 V analog output. A shield is provided to reduce
outside electrical interference from degrading the signal quality of the transducer 0-
5 V analog output that is transmitted back to the Supervisor. The third electrical
connection is a three wire interface to ensure the stepper motor does not burn out.
A limit switch defines the end of travel for the stepper motor. Once this limit switch
is reached, the stepper motor will not be driven farther in that direction.
All three interfaces are serviced by a single cable harness, defined in Appendix A,
which has two 15-pin d-shell connectors. The 15-pin d-shell cable plug with male
contact pins (P3) is connected to the Supervisor. The cable plug with the female
contacts (P4) is connected to the SENTRY 1510. No special hardware is required
to make the connection. The connectors have alignment keys that must be
aligned with the mating panel connector. Secure the cable with tie-wraps or other
strain relief fasteners.
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