Installation Model
3020T
Teledyne
Analytical
Instruments
24
Table 3-1: Analog Concentration Output—Example
Voltage Signal
Current Signal
%
O
2
Output (VDC)
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, a second pair of analog
output terminals are used. They generate a steady preset voltage (or
current when using the current outputs) to represent a particular range.
Table 3-2 gives the range ID output for each analysis range.
Table 3-2: Analog Range ID Output—Example
Range
Voltage (V)
Current (mA)
LO 0.25
8
MED 0.50 12
HI
0.75 16
CAL
(0-25%)
1.00 20
3.3.4 Alarm Relays
There are three alarm-circuit connectors on the alarm relays block
(under RELAY OUTPUTS) for making connections to internal alarm
relay contacts. Each provides a set of Form C contacts for each type of
alarm. Each has both normally open and normally closed contact
connections. The contact connections are indicated by diagrams on the
connector panel. They are capable of switching up to 3 amperes at
250 V ac into a resistive load. See Figure 3-6.