Emerson M22, M21 user manual Reg Current Output Status LED Meaning Value Red Green

Sensor Status Registers, Transmitter Status LED, Current output and Meaning

Table 6 below, shows the sensor status registers, and the transmitter’s current output, along with corresponding status LED and meaning.

Note: To differentiate between conditions resulting in 2.5 mA, view the Event Log. See Event Log menu option.

Table 6: Current output and meaning

Reg.		Current Output	Status LED		Meaning
Value		(mA)	Red	Green
0		4 – 20	Slow Flash	Flash	Normal Sensor operation – regularly calculates
			(Gas found)	(No Gas)	gas concentration.
	3.0			Solid	Sensor is zeroing itself ( Cal Mode)
1
2	3.3		Very Fast		Sensor is waiting until it detects application of
			Flash		cal gas.
3	3.3		Very Fast		Sensor waits until gas level stabilizes, then
			Flash		begins spanning.
	3.6			Solid	Spanning is complete, user asked to remove gas.
4
5	3.6			Solid	Displayed for 4 seconds once gas decreases to
					3% FS after user asked to remove cal gas.
6	2.5		Very Fast		Sensor is not calibrated, requires user to
			Flash		calibrate.
7	3.0		Slow Flash		Sensor is waiting for 90 seconds to allow the
					signal to stabilize ( Start Delay)
9	3.0/3.3		Solid	Solid	Signal was too unstable to acquire accurate zero
					after 90 seconds
					Displayed for 4 seconds is the cal gas was
10	3.0/3.3		Solid	Solid	removed prematurely OR is a 90 second time
					limit has elapsed and the signal was too
					unstable to acquire accurate data
		4 – 20	Fast Flash		See Event Log in transmitter main menu.
11
		4 – 20	Fast Flash		See Event Log in transmitter main menu.
12
	2.5		Fast Flash		FAULT DETECTED: Input voltage <8V.
13
14	2.5		Fast Flash		FAULT DETECTED: Input voltage >33V.

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MAN-0076 Rev 05 Millennium II December 07, 2012

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