30
Model 4688-IR / 4679-IR
Operation & Maintenance Manual
Manual #087-0007G, 10/2003
Latching / Non-Latching and Non-F
Latching / Non-Latching and Non-F
Latching / Non-Latching and Non-F
Latching / Non-Latching and Non-F
Latching / Non-Latching and Non-Fail-
ail-
ail-
ail-
ail-safe / F
safe / F
safe / F
safe / F
safe / Fail-
ail-
ail-
ail-
ail-
safe Operation
safe Operation
safe Operation
safe Operation
safe Operation
The relays can be used in latching and non-latching modes, and can be fail-
safe or non-fail-safe (per ANSI/ISA standard SP12.13, the high-high alarm can
only be used in latching mode). In fail-safe operation, relays are normally
energized and de-energized upon alarm activation (in non-fail-safe operation
the relays are normally de-energized). In latching mode, alarm indicators
must be manually reset by touching any key with the magnet.
Note that
alarm indicators and relays can only be reset if the measured
concentration is at or below the reset point.
Sensor Parameters
Sensor Parameters
Sensor Parameters
Sensor Parameters
Sensor Parameters
The
USER Menu's
"SR".xx parameters enables users to change various
sensor-related parameters such as engineering units, decimal precision,
damping constant, and type gas measured (although the 4688-IR will sense
many hydrocarbons, the output will only be linear to a single gas).
For information purposes, the GasPlus-IR also enables users to view certain
values held in memory, such as the instrument's full scale (100% LEL or the
corresponding %v/v of the gas being measured), the date the transmitter was
last zeroed, and ambient temperature.
Report Generation
This Report function would typically be accessed in the field through the RS-
232 connection with the output going to a portable printer, datalogger, or PC.
Report generation is accomplished through the
COMM Menu
. Through the
user interface, you may program the 4688-IR to generate one-line reports at
intervals ranging from once every second to once every 2 hours (7200
seconds). These reports contain the instrument ID (001-247) and up to 8
fields for data such as date, time, temperature, gas concentration and alarm
status. Additionally, the format of the one line report may be controlled for
easy import into word processing or spreadsheet programs such as
Microsoft
®
Wordand Microsoft Excel
®
.
The data that is printed in each of the 8 fields is specified by setting the
appropriate code (1-13) in the RP.F1 through RP.F8 parameters. RP"
parameters are found in the COMM menu (see "
Instrument Navigation &
Parameter Reference
")
In addition to controlling the fields, you also have control over the delimiters
appearing between the fields and the termination characters appearing at the
end of the line. For these strings, you may specify up to 5 ASCII characters
(including spaces, commas, tabs, quotes, etc.) . All you need to know are the
hexadecimal ASCII codes for each character in the string. If the delimiter or
termination string is less than 5 characters, you must enter 0 after the last
character. Characters appearing after the 0 will be ignored.
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