Intek RheoVac 950 - Manual (Page 10)

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Inspect the probe tips. Be sure wetted surfaces are clean before installing. If cleaning is
needed, use a damp cloth wetted with alcohol and wipe dry using a second dry, soft, lint-free
cloth. Do not immerse probes in alcohol or any other liquids. This may damage the probe
sensors.
Ò
Be sure to power up your RheoVac instrument system and probe(s) for at least 30 minutes
before inserting probes into the vent line hot taps. DO NOT leave probe in vent line
unpowered or when flooding the condenser.
Ó
Install each probe. The probe should be mounted through the pipe wall using the hot-tap
assembly. The probe installs so that the two sensor tips are side-by-side across the gas stream.
The probes have a flow directional arrow on the junction box. When installing under vacuum,
do not allow the clamp to "slam" against the seal nut upon opening the valve. Grasp the probe
firmly, with hand against the seal nut, before opening the ball valve. Allow the probe shaft to
slide slowly through the valve by controlling the amount of grip on the probe shaft. Special
installation instructions, if any, will be noted in SECTION 6.
Ô
Prior to inserting probe, loosen the compression nut on the thermocouple connector of the hot
tap and clean the inner surface of the thermocouple connector to ensure it is free of particles
that may cause probe damage.
2.5 ELECTRICAL CONNECTIONS
.
IMPORTANT
.
Inspect and VERIFY these electrical connections carefully. Improper
connection could damage electronic components and sensor function. If additional holes need to
be drilled in the processor enclosure, remove the electronics subassembly (mounted on a mounting
plate) and temporarily store inside an ESD bag in a safe, clean place. Do not drill with electronics
boards inside the enclosure.
A. Main Processor Unit (see Figure 5)
1. Sensor Power and Communication Line: Connect the distribution box to this main processor
box using the RS-485 Comm unications/Power cable. Follow indicated connector color code.
[communications: white (A), blue (B) and shield (SH); power: 24Vdc, red (+), and black (
!)]
2. Main Power: Connect main power terminals to a dedicated 100-250Vac, single phase, 15 amp
circuit. An external disconnect switch should be used for disconnecting power to the
system during outages. Power connection wires should be at least 18 gauge and comply with
accepted wiring codes. SW1 is used for cycling power to reset.
3. Serial Communication: Connector JP3 is the RS-232 serial communication interface. This
interface should only be used for distances of 20 feet or less, such as to a laptop computer. A
20 foot serial cable with a DB-9 connector can be shipped upon request (see Figure 9 and
Table I below).
An RS-422 serial communication interface is present for long data
communications when configured without 4-20 mA outputs.
Table I RJ-11 to DB-9 Module Adapter
RS-232 CONFIGURATION RS-422 CONFIGURATION
RJ-11 Pin Out DB-9 Pin Out RJ-11 Pin Out DB-9 Pin Out
1 Tx (transm it) 1 N/C 1 Tx+ (transmit+) 1 Rx
S
(receive
S
)
2 N/C 2 Tx (transm it) 2 Tx
S
(transmit
S
) 2 Rx+ (receive+)
3 Rx (receive) 3 Rx (receive) 3 Rx+ (receive+) 3 Tx+ (transmit+)
4 N/C 4 N/C 4 Rx
S
(receive
S
) 4 N/C
5 Power (+5V) 5 Ground 5 Power (+5V) 5 Ground
6 Ground 6 Pulled high 6 Ground 6 Tx
S
(transmit
S
)
7 N/C 7 7 TBD
8 Pulled high 8 8 TBD
9 N/C 9 9 TBD