Teledyne 3020T operating instructions Range Voltage Current mA, Alarm Relays

3 Installation Model 3020T

Table 3-1: Analog Concentration Output—Example

	Voltage Signal	Current Signal
ppm O2	Output (V dc)	Output (mA dc)
0	0.0	4.0
10	0.1	5.6
20	0.2	7.2
30	0.3	8.8
40	0.4	10.4
50	0.5	12.0
60	0.6	13.6
70	0.7	15.2
80	0.8	16.8
90	0.9	18.4
100	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.

3-6 Teledyne Analytical Instruments