Oxymitter 4000

Instruction Manual

IB-106-340 Rev. 3.0 December 2003

6.O2 Next Cal – If automatic calibration is selected, this selects the time until the first initial calibration takes place.

7.Autocalibrate – Select if an SPS or IMPS autocalibration system is part of the system.

8.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.

9.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.

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 in- creasing 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 4-1.

(b)Low O2 Alarm – If any of the condi- tions 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 in not normally input by the user.

3.O2 T90 Time – Some users may feel that the O2 reading is too active for certain processes. The feature permits the user to dampen the O2 signal. De- fault value is zero seconds dampening.

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, and additional 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

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Emerson 4000 manual SYSTEM/Input/Output, SYSTEM/Parameters
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4000 specifications

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