Emerson Process Management OXYMITTER 4000 instruction manual Logic I/O

Instruction Manual

IB-106-340C Rev. 4.1 July 2004

Hazardous Area Oxymitter 4000

The HART option is not protected by energy limiting barriers. It must not be interfaced from within the hazardous area. The 4-20 mA cables should be routed and the connections made out- side the hazardous area. Note that this is the case even when using the intrin- sically safe version of the handheld communicator.

4-2 LOGIC I/O

This two-terminal logic contact can be config- ured either as a solid-state relay-activated alarm or as a bi-directional calibration handshake sig- nal to an IMPS 4000 or SPS 4000. The configu- ration 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 4-1.

a.Alarm

When configured as an alarm, this signal alerts you to an out-of-spec condition. The output is +5 Vdc in series with a 340 ohm resistor.

For optimum performance, Rosemount rec- ommends connecting the output to a Potter

&Brumfield 3.2 mA DC relay (P/N R10S- E1Y1-J1.0K).

Of the ten modes in Table 4-1,mode 1 through mode 7 are the alarm modes. The factory default is mode 5 for Hazardous Area Oxymitter 4000 units without an IMPS 4000 or SPS 4000. In this mode, the output will signal when a unit alarm or a CALIBRA- TION RECOMMENDED indication occurs.

b.Calibration Handshake Signal

If using an optional IMPS 4000 or SPS 4000, the logic I/O must be configured for calibration handshaking. Of the ten modes in Table 4-1,only modes 8 and 9 are con- figured for calibration handshaking. For a Hazardous Area Oxymitter 4000 with an IMPS 4000 or an SPS 4000, the factory sets the default to mode 8. In this mode, the logic I/O will be used to communicate between the Hazardous Area Oxymitter 4000 and the sequencer and to signal the sequencer when a CALIBRATION REC- OMMENDED indication occurs.

Table 4-1. Logic I/O Configuration (as set at HART/AMS or LOI)

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 Imped-
	ance/CALIBRATION RECOMMENDED.
6	The unit is configured for both a Low O2 and High AC Imped-
	ance/CALIBRATION RECOMMENDED.
7	The unit is configured for a Unit Alarm, a Low O2, and a High AC Im-
	pedance/CALIBRATION RECOMMENDED.
8**	The unit is configured for a calibration handshake with IMPS 4000 or
	SPS 4000. CALIBRATION RECOMMENDED will initiate the calibra-
	tion cycle.

9

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

*The default condition for a Hazardous Area Oxymitter 4000 without an IMPS 4000 or SPS 4000.

**The default condition for a Hazardous Area Oxymitter 4000 with an IMPS 4000 or SPS 4000.

4-4 Configuration with LOI Rosemount Analytical Inc. A Division of Emerson Process Management