Teledyne 2020 - Explosion proof thermal conductivity analyzer - Manual (Page 12)

Teledyne Analytical Instruments 1-6
1 Introduction Model 2020
• Power Connection 115 or 230 V dc, 50 or 60 Hz.
• Analog Outputs 0-1 V dc concentration plus 0-1 V dc
range ID. Additional, isolated 4-20 mA
dc plus 4-20 mA dc range ID available.
• Alarm Connections 2 concentration alarms and 1 system
alarm.
• RS-232 Port Serial digital concentration signal
output and control input.
• Remote Valves Used for controlling external solenoid
valves, if desired.
• Remote Sensor Used for external sensor and
thermocouple, if desired.
• Remote Span/Zero Digital inputs allow external control of
analyzer calibration.
• Calibration Contact To notify external equipment that
instrument is being calibrated and
readings are not monitoring sample.
• Range ID Contacts Four separate, dedicated, range relay
contacts. Low, Medium, High, Cal.
• Network I/O Serial digital communications for local
network access. For future expansion.
Not implemented at this printing.
1.8 Gas Connections
The gas connectors are on the bottom of the Model 2020 chassis near
the front doorl.
A sample system must be provided for introduction of zero and span
gas, as well as sample gas, into the sample path, and for controlling the
flowrates through the sample and reference paths of the analyzer. Appropri-
ate pressure reducing regulators must be installed at all gas supply sources.
Gas Connector-and-Selector Panels for specific applications are
available at additional cost. These panels are optional designed to substitute
a standard front panel.
For those customers wishing to incorporate their own sample controls,
the recommended system piping schematic is included among the drawings
at the rear of the manual.