Teledyne 3020M - Explosion proof paramagnetic oxygen analyzer - Manual (Page 31)

Percent Paramagnetic Oxygen Analyzer Installation 3
3-9 Teledyne Analytical Instruments
1) Test the CRC. When the CRC is open, Send a zero command
until the CRC closes (The CRC will quickly close.)
2) When the CRC closes, remove the zero command.
3) When CRC opens again, send a span command until the CRC
closes. (The CRC will quickly close.)
4) When the CRC closes, remove the span command.
When CRC opens again, zero and span are done, and the sample is
being analyzed.
Note: The remote probe connections (paragraph 3.3.9) provides
signals to ensure that the zero and span gas valves will be
controlled synchronously. If you have the –C Internal valve
option—which includes additional zero and span gas inputs—
the 3020M automatically regulates the zero, span and sample
gas flow.
3.3.6 Range ID Relays
There are four dedicated RANGE ID CONTACT relays. The first
three ranges are assigned to relays in ascending order—Low range is as-
signed to RANGE 1 ID, Medium range is assigned to RANGE 2 ID, and
High range is assigned to RANGE 3 ID. RANGE 4 ID is reserved for the
Air Cal Range (25%).
3.3.7 Network I/O
A serial digital input/output for local network protocol. At this printing,
this port is not yet functional. It is to be used in future versions of the instru-
ment.
3.3.8 RS-232 Port
The digital signal output is a standard RS-232 serial communications
port used to connect the analyzer to a computer, terminal, or other digital
device. The pinouts are listed in Table 3-3.
Table 3-3: RS-232 Signals
RS-232 Sig RS-232 Pin Purpose
DCD 1 Data Carrier Detect
RD 2 Received Data
TD 3 Transmitted Data