Emerson B-106-300NH instruction manual Heater optional, Purge optional, Theory of Operation

Instruction Manual

Appendix E Rev. 4.5 June 1999

World Class 3000

e.Heater (optional)

A heater is available for ambient conditions below 32°F (0°C).

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 Immunity Standard	EN 50 082-1
Electrical Noise Radiated Emission Standard	EN 55 011
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,
	or 10-0 V output
O2 Accuracy (analog output)	0.1% O2 or ±3% of reading, whichever is greater using
	Hagan calibration gases
O2 Range	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 (optional)	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