Instruction Manual

IB-106-340 Rev. 3.0 December 2003

Oxymitter 4000

4-2 LOGIC I/O

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 4000. 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 4-1.

a.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 re- sistor. For optimum performance, Rose- mount 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 4-1,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 4000. In this mode, the output will signal when a unit alarm or a CALIBRATION 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 an 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 Oxymit- ter 4000 and sequencer and to signal the sequencer when a CALIBRATION REC- OMMENDATION indication occurs.

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

Mode

Configuration

0The unit is not configured for any alarm condition.

1The unit is configured for a Unit Alarm.

2The unit is configured for Low O2.

3The unit is configured for both a Unit Alarm and Low O2.

4The 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 4000.

 

CALIBRATION RECOMMENDED will initiate the calibration cycle.

9The unit is configured for a calibration handshake. CALIBRATION RECOM- MENDED will not initiate the calibration cycle with the IMPS 4000 or SPS 4000.

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

4-4 Configuration with LOI

Rosemount Analytical Inc. A Division of Emerson Process Management