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1.8 Options
1.8.1 Auto-Zero Option
This option consists of a three way valve that is used to admit customer supplied oxygen
or zero gas into the instrument for performing an automatic or manual zero calibration.
This calibration can be done automatically once a day or at some other pre-set interval, or
can be controlled by an external system, such as a PLC.
1.8.2 Isolated Current Output (4-20mA or 2-20mA)
This option converts the M450H’s voltage output to an isolated 4-20mA driver with an
integral loop power supply. It is programmable for 4-20mA or 0-20mA and has a 1500 V
common mode voltage isolation and 240 V RMS normal mode voltage protection. V
loop
=
28V max which is sufficient to drive up to a 1000 ohm load.
1.8.3 Flow-meter
A variable area flowmeter can be included on the front panel to give a visual indicator of
gas flow through the instrument.
1.8.4 Ozone Killer
This option consists of a catalytic ozone scrubber that converts most of the ozone back
into oxygen before it is exhausted from the instrument.
1.8.5 Flow Switch
This option is an on/off type flow switch that is used to send a signal to the CPU in case
the flow drops below the minimum required for proper operation of the instrument. In
case of flow failure, the instrument will issue a warning on the front panel and will turn
on the flow warning status bit, indicating an instrument error.
1.8.6 Rack mount with slides
This option, including slides and rack mounting ears, permits the Monitor to be mounted
in a standard 19" wide x 30" deep RETMA rack. This option is not available for the
NEMA 4X enclosure.
P/N 02826B1 Teledyne API Model 450H O
3
Monitor Instruction Manual - Page 26