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M400E Ozone Analyzer Operator’s Manual Optional Hardware and Software
04315 Rev. C1 47
5.4. CURRENT LOOP ANALOG OUTPUTS (OPT 41)
This option adds isolated, voltage-to-current conversion circuitry to the analyzer’s Analog Outputs enabling them
to produce current loop signals. This option may be ordered separately for Analog Outputs A1 and A2. It can be
installed at the factory or added later. Call the factory for price and availability.
Current Loop Option
Installed on Analog
Output A2
Figure 5-2: Current Loop Option Installed
The Current Loop Option can be configured for any output range between 0 and 20mA DC. Most current loop
applications require either 2-20 mA or 4-20 mA spans. Information on calibrating or adjusting these outputs can
be found in Section 7.4.2.4
5.4.1. CONVERTING CURRENT LOOP ANALOG OUTPUTS TO STANDARD
VOLTAGE OUTPUTS.
To convert an output configured for current loop operation to the standard 0 to 5 VDC output operation:
1. Turn off power to the analyzer.
2. If a recording device was connected to the output being modified, disconnect it.
3. Remove the top cover
Remove the set screw located in the top, center of the rear panel
Remove the screws fastening the top cover to the unit (one per side).
Slide the cover back and lift the cover straight up.
4. Disconnect the current loop option PCA from the appropriate connector on the motherboard (see Figure
5-2).
5.
Place a shunt between the leftmost two pins of the connector (see Figure 5-2).
6 spare shunts (P/N CN0000132) were shipped with the instrument attached to JP1 on the back of
the instruments keyboard and display PCA
6. Reattach the top case to the analyzer.
7. The analyzer is now ready to have a voltage-sensing, recording device attached to that output
Note
See Chapter 14for more information on preventing ESD damage.