Teledyne 7320 - NDIR analyzer - Manual (Page 20)

2 Installation Model 7320
2-6 Teledyne Analytical Instruments
as 0–10 % carbon monoxide, then the output would be as shown in
Table 2-1.
Table 2-1: Analog Concentration Output—Example
Percent Voltage Signal Current Signal
CO Output (V dc) Output (mA dc)
0 0.0 4.0
1 0.1 5.6
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 2-2 gives the range ID
output for each analysis range.
Table 2-2: 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