Emerson Process Management OXYMITTER 4000 SYSTEM/Input/Output, SYSTEM/Parameters

Hazardous Area Oxymitter 4000

Instruction Manual

IB-106-340C Rev. 4.1 July 2004

7.Gas Time – How long should each cal gas flow. Factory default is 300 sec- onds, but the user may want to vary this depending upon the length of cali- bration gas tubing runs.

8.Purge Time – Used if the O2 output is selected to hold the last value during calibration. After the second cal gas is removed, how long until the sensor comes back to the normal process reading, and the 4-20 mA signal can be released.

9.Auto Calib? – Select “Yes” if an SPS or IMPS autocalibration system is part of the system.

b.SYSTEM/Input/Output

1.Analog – Pertaining to the analog 4-20 mA signal representing O2.

(a)O2 Type – 4-20 mA signal may be configured to increase with increasing O2 or the reverse.

(b)O2 Range – Upper O2 range is user selectable.

(c)O2 Alarm Level – User can config- ure the digital output to alarm at a given O2 level.

(d)Do O2 Trim – Procedure for cali- brating the 4-20 mA signal to a precision mA source. Procedure is intuitive.

2.Digital – A bi-directional logic signal may be configured as an alarm, or as a calibration handshake signal.

(a)Logic I/O Mode – One of 9 different sets of conditions can be set for the digital signal. See Table 8-2.

(b)Low O2 Alarm – If any of the con- ditions noted above include a low O2 process alarm, set the value here.

(c) Input State – Notes the current condition of the bi-directional digital signal.

(d) Force Output – Forces the output state of the signal to either open or closed. This is used primarily when diagnosing potential problems with this signal.

c. SYSTEM/Parameters

1. O2 Slope – O2 slope is data regarding
the strength of the sensing cell output.
This information is automatically cal-
culated after a calibration, and the user
does not normally input this data.
2. O2 Constant – O2 constant is the
amount of voltage a cell generates
with ambient air as the calibration gas.
Again, this is normally calculated as a
result of calibration, and is not normally
input by the user.
3. O2 T90 Time – Some users may feel
that the O2 reading is too active for
certain processes. This feature permits
the user to dampen the O2 signal. The	6
default value is zero seconds damp-
ening.

4.Auto Tune – The electronics detects the line voltage powering the instru- ment automatically, and picks proper algorithms for heater control. User can force a high voltage algorithm, or a low, but Auto Tune is the default, and is recommended.

5.Lockout Time – Keypad lockout time default is 30 sec., but is user configur- able. A “Z” keypad pattern will unlock the keypad.

6.Revert Time – Once a user goes one level deep into the menu structure, an additional “revert time” is provided to prevent nuisance lockouts. One hour is the default, and it is user configurable.

7.Luminance – Gas florescence bright- ness is user adjustable.

Rosemount Analytical Inc. A Division of Emerson Process Management Startup and Operation with LOI 6-5