Heater Unit Regulation; Temperature Measurement; Invalid Pressure Measurement - Emerson ROSEMOUNT Analytical NGA 2000 Instruction Manual

Instruction Manual
90002929
07/2006
10.3.6

Heater Unit Regulation

Possible Causes
a) PCB "BHZ" failure
b) Voltage supply absent
10.3.7

Temperature Measurement

Possible Causes
a) Chopper not or not correct connected
to PCB "PIC"/"DSP"
b) Temperature sensor not or not correct
connected / defective
(temperature shown in display not in
a range of + 15 °C to + 70 °C)
10.3.8

Invalid Pressure Measurement

Possible Causes
a) Instrument without pressure sensor
b) Pressure sensor not or not correct
connected / defective
(pressure show in display not in
a range of 800 hPa to 1,200 hPa)
Emerson Process Management GmbH & Co. OHG
NGA 2000 MLT Hardware
Check / Correct
Check PCB "BHZ" (Section 11.2)
Check voltage supply
(Section 10.1 / 11.1.1)
Check / Correct
Check connection of Chopper
(Fig. 1-20) or Chopper
Check connection of sensor
(Fig. 1-32, P10 / P20) or
sensor PCB "DSP" (Fig. 1-21).
Exchange temperature sensor
(Fig. 17-2, Item 3)
Check / Correct
Check wether software parameter
"pressure measurement" is set to
"manual measurement".
Check, that correct pressure value is entered.
Check connection of sensor
(Fig. 1-32, P1 / P9) or
sensor PCB "DSP" (Fig. 1-33)
Exchange pressure sensor.
TROUBLESHOOTING
DISPLAY MESSAGES
PCB "PIC"
PCB "DSP" (Fig. 1-33)
PCB "PIC"
PCB "PIC"
10 - 5