11-07-2013
P-800LT Freeze Point Analyzer
3-10
Installation and Startup
The P-800LT-1500 Freeze Point Analyzer has internal and external grounding harnesses that tie all
enclosures and power distribution together to a grounding lug mounted to the Analyzer frame leg. The
grounding wire is 10 gauge with a green/yellow spiral Teflon
®
insulation and a 36 x 26 strand. Customer
earth connection is made at this point (Figure 3-5).
Figure 3-5: Customer Earth Connection
C
ONTROL
R
OOM
S
IGNALS
The Analyzer incorporates analog, serial, and relay output capability. ModBus output may be provided as
a factory installed option.
The connections for control room signals are made in the either the Customer Connections Enclosure
(Figures 3-4a and 3-4b) or the Control Enclosure (Figure 3-6).
Analog Output
One isolated 4-20 mA output is standard on the P-800LT Freeze Point Analyzer. An optional two
additional 4-20 mA outputs may be provided. These connections are made in the Customer Connections
Enclosure (Figures 3-4a and 3-4b). See Section 4 for information on setting the 4-20mA parameters.
Relay Output
The Analyzer incorporates three SPDT relay contacts rated at 3A resistive load at 250 VAC. The relays
may be programmed for either normal (non-energized) or failsafe (energized) operation and used to
signal a variety of operational conditions. These connections are made in the Customer Connections
Enclosure (Figures 3-4a and 3-4b). See Section 4 for information on alarm programming.
Serial Output
[The P-800LT Freeze Point Analyzer incorporates RS232 serial output. The maximum allowable external
cable length on the RS232 output 98 feet is (30 meters). This connection is made in the Customer
Connections Enclosure (Figures 3-4a and 3-4b). RS485 serial output (Figure 3-6) is available as an
option and requires an auxiliary communications module (consult factory);.
Serial communication operates at 9600 baud, no parity, 8 start bits, 1 stop bit. Data is comma delimited
and output in the following sequence:
Date (mm/dd/yy)
Time (hr/min/sec)
Freeze point value (XX.XX°)
A <CR> is used to designate the end of the data stream.
