Instruction Bulletin

Appendix E Rev. 4.6 May 2005

World Class 3000

f.Z-Purge (optional)

A Z-purge arrangement is available for ap- plications requiring hazardous area classifi- cation. See Application Data Bulletin AD 106-300B.

E-2 THEORY OF OPERATION

A functional block diagram of the IFT, con- nected to the HPS and probe, is shown in Figure E-2. In operation, the IFT monitors the temperature of the cell by means of the probe thermocouple. The IFT controls the temperature of the cell. If the temperature of the cell be- comes too high, the IFT will disable the HPS.

A cold junction temperature compensation fea- ture ensures an accurate probe thermocouple reading. A temperature sensor in the heater power supply monitors the temperature at the junction between the compensated cable run- ning to the probe and the uncompensated cable running to the IFT. The voltage from this sensor is used by the IFT to compensate the probe thermocouple readings for the temperature at the junction.

The cell signal is a voltage proportional to the oxygen concentration difference between the two sides of the cell. The IFT receives this sig- nal and translates it into a user-specified form for display and/or output.

Table E-1. Specifications for Intelligent Field Transmitter

Environmental Classification

NEMA 4X (IP56)

Humidity Range

95% Relative Humidity

Ambient Temperature Range

-20° to 122°F (-30° to 50°C)

Vibration

5 m/sec2, 10 to 500 xyz plane

Electrical Noise

EN 61326, Class A

Installation Category

Overvoltage Category II (IEC 664)

HART Communications

Modulated on a 4-20 mA analog output, only

Analog Outputs

isolated, 0-20 mA, 4-20 mA, 0-10 V, 20-0 mA, 20-4 mA,

O2 Accuracy (analog output)

or 10-0 V output

0.1% O2 or ±3% of reading, whichever is greater using

O2 Range

Hagan calibration gases

Field Selectable 0-40% (linear or logarithmic)

Power Supply

100/120/220/240 ±10% Vac at 50/60 Hz.

Power Requirements

(w/HPS 3000): 30 Watts (VA); (w/Model 218 Probe):

 

275 VA (w/WC 3000 Probe): 275 Watts (VA)

Output Resolution

11 bits (1 bit = 0.05% of output F.S.)

System Speed of Response (amplifier output)

less than 3 seconds

Resolution Sensitivity - Transmitted Signal

0.01% O2

Deadman Contact Output

Form-C, 48 Volt max, 100 mA max

Programmable Contact Outputs

2 available, Form-C, 48 V max, 100 mA max

GUI/LED Display Board

1, with 0.8 in. (20 mm) high, 3-character, alphanumeric

 

LED display 4-line by 20-character backlight LCD

 

alpha-numeric display; 8-key general purpose key-

 

board, or HART device

Approximate Shipping Weight

25 lbs (11 kg)

 

 

E-2 Appendices

Rosemount Analytical Inc. A Division of Emerson Process Management

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Emerson 3000 instruction manual Purge optional, Table E-1. Specifications for Intelligent Field Transmitter
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3000 specifications

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