Emerson Process Management IM-106-340 instruction manual Logic I/O, Alarm

Instruction Manual

IM-106-340, Rev. 4.0 May 2006

Oxymitter 4000

LOGIC I/O

Table 3-1. Logic I/O Configuration (as set at HART/AMS or LOI)

When a calibration has been initiated, the value at TP5 and TP6 is the % O2 seen by the cell.

Oxygen levels, as seen on the multimeter, are:

8.0% O2 = 8.0 VDC

0.4% O2 = 0.4 VDC

2.HART/AMS.

3.Model 751. The loop-driven LCD display.

This two-terminal logic contact can be configured either as a solid-state relay-activated alarm or as a bi-directional calibration handshake signal to an IMPS 4000 or SPS 4001B. The configuration of this signal depends on the setting of the LOGIC I/O PIN MODE via HART/AMS or LOI. The ten different modes available are explained in Table 3-1.

Mode	Configuration
0	The unit is not configured for any alarm condition.
1	The unit is configured for a Unit Alarm.
2	The unit is configured for Low O2.
3	The unit is configured for both a Unit Alarm and Low O2.
4	The unit is configured for a High AC Impedance/CALIBRATION
	RECOMMENDED.
5*	The unit is configured for both a Unit Alarm and a High AC
	Impedance/CALIBRATION RECOMMENDED.

6The unit is configured for both a Low O2 and High AC Impedance/CALIBRATION

RECOMMENDED.

7The unit is configured for a Unit Alarm, a Low O2, and a High AC Impedance/CALIBRATION RECOMMENDED.

8**	The unit is configured for a calibration handshake with IMPS 4000 or SPS 4001B.
	CALIBRATION RECOMMENDED will initiate the calibration cycle.

9The unit is configured for a calibration handshake. CALIBRATION RECOMMENDED will not initiate the calibration cycle with the IMPS 4000 or SPS 4001B.

*The default condition for an Oxymitter 4000 without an IMPS 4000 or SPS 4001B. **The default condition for an Oxymitter 4000 with an IMPS 4000 or SPS 4001B.

Alarm

When configured as an alarm, this signal alerts you to an out-of-spec condition. The output is 5 V in series with a 340 ohm resistor. For optimum performance, Emerson Process Management recommends connecting the output to a Potter & Brumfield 3.2 mA DC relay (P/N R10S-E1Y1-J1.0K).

Of the ten modes in Table 3-1,mode 1 through mode 7 are the alarm modes. The factory default is mode 5 for Oxymitter 4000 units without an IMPS 4000 or SPS 4001B. In this mode, the output will signal when a unit alarm or a CALIBRATION RECOMMENDED indication occurs.

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