Emerson UVU-140A-AR Normal Operation, Fire Condition, Current & Relay Output Conditions

The UVU-140-A or UVU-140-AR current output will change with the amount of ultraviolet light being detected (see Table 4).

2.Turn off the UV test lamp.

3.Repeat steps 1 & 2 for all detectors in the system.

4.After all detectors have been checked, return the system to the normal operating mode.

5.Restore power to output loads or remove any mechanical blocking devices.

CHAPTER 4 NORMAL OPERATION

Normal Operation

In normal operation the detector outputs 4mA.

Fire Condition

In a fire condition the detector outputs 20mA.

Current & Relay Output Conditions

The 4-20mA DC current output transmits system information to other devices. The current output can only be wired for non-isolated operation. The current output can have a maximum external loop resistance of 600 Ohms at

10.5to 32Vdc. Table 4 shows the current output levels for various conditions.

Table 4 - Current & Relay Output Conditions

Current Output	Situation
0mA	Shorted signal output or loss of power
1mA	Internal power fault or system power out of range. Fault relay
	activated on UVU-140-AR
2mA	Automatic or manual vi test failure. Fault relay activated on
	UVU-140-AR
4mA	Normal operation
6mA	Background UV source
10mA	Manual vi test (adequate) clean all optical surfaces.
11mA	Manual vi test (good) optical surfaces are moderately clean
12mA	Manual vi test (excellent) all optical surfaces are clean
16mA	Instant alarm
20mA	Fire condition detected. Fire relay activated on
	UVU-140-AR

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