Teledyne 7120 - NDIR analyzer - Manual (Page 15)

Photometric Analyzer Installation 2
2-7 Teledyne Analytical Instruments
2 0.2 7.2
3 0.3 8.8
4 0.4 10.4
5 0.5 12.0
6 0.6 13.6
7 0.7 15.2
8 0.8 16.8
9 0.9 18.4
10 1.0 20.0
To provide an indication of the range, the Range ID analog outputs are
used. They generate a steady preset voltage (or current when using the
current outputs) to represent a particular range. Table 2-4 gives the range ID
output for each analysis range.
Table 2-4: Analog Range ID Output—Example
Range Voltage (V) Current (mA) Application
Range 1 0.25
8 90-100% CO/N
2
Range 2 0.50 12 95-100% CO/N
2
Range 3 0.75 16 0-100% CO/N
2
Range 4 (Cal) 1.00 20 98-100% CO
2
/N
2
2.3.3.2 Alarm Relays
The nine alarm-circuit connector pins connect to the internal alarm relay
contacts. Each set of three pins provides one set of Form C relay contacts.
Each relay has both normally open and normally closed contact connections.
The contact connections are shown in Figure 2-4. They are capable of
switching up to 3 amperes at 250 V ac into a resistive load. The connectors
are:
Threshold Alarm 1:
• Can be configured as high (actuates when concen-
tration is above threshold), or low (actuates when
concentration is below threshold).
• Can be configured as failsafe or nonfailsafe.
• Can be configured as latching or nonlatching.
• Can be configured out (defeated).
Threshold Alarm 2: • Can be configured as high (actuates when concen-
tration is above threshold), or low (actuates when