Teledyne 9110T instruction manual Connecting the Communications Interfaces, Alarm 4 Relay

Model 9110T NOx Analyzer	Getting Started
Alarm 3 Relay	NO2 Alarm 2 = xxx PPM
Alarm 2 Relay	NOX Alarm 1 = xxx PPM
Alarm 3 Relay	NOX Alarm 2 = xxx PPM

The Alarm 2 Relay will be turned on any time the concentration set-point is exceeded & will return to its normal state when the concentration value goes back below the concentration set-point.

Even though the relay on the rear panel is a NON-Latching alarm & resets when the concentration goes back below the alarm set point, the warning on the front panel of the instrument will remain latched until it is cleared. You can clear the warning on the front panel by either pushing the CLR button on the front panel or through the serial port.

In instruments that sample more than one gas type, there could be more than one gas type triggering the Concentration 1 Alarm (“Alarm 2” Relay). For example, the 9110T instrument can monitor both NO & NO2 gas. The software for this instrument is flexible enough to allow you to configure the alarms so that you can have 2 alarm levels for each gas.

NO Alarm 1 = 20 PPM

NO Alarm 2 = 100 PPM

NO2 Alarm 1 = 20 PPM

NO2 Alarm 2 = 100 PPM

In this example, NO Alarm 1 & NO2 Alarm 1 will both be associated with the “Alarm 2” relay on the rear panel. This allows you do have multiple alarm levels for individual gases.

A more likely configuration for this would be to put one gas on the “Alarm 1” relay and the other gas on the “Alarm 2” relay.

NO Alarm 1 = 20 PPM

NO Alarm 2 = Disabled

NO2 Alarm 1 = Disabled

NO2 Alarm 2 = 100 PPM

“ALARM 4” RELAY

This relay is connected to the “range bit”. If the instrument is configured for “Auto Range” and the instrument goes up into the high range, it will turn this relay on.

3.3.1.8. Connecting the Communications Interfaces

The T-Series analyzers are equipped with connectors for remote communications interfaces: Ethernet, USB, RS-232, RS-232 Multidrop and RS-485(each described here). In addition to using the

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