Ac Power Checks; Furnace Checks; Cell Checks - Ametek Dycor CG1000-RTP User Manual

AC Power Checks

AC Power Checks

Furnace Checks

Furnace Checks
Verify the correct line voltage at J4,
Pins 1 and 4 of the backplane board.
If voltage is present but system is
not heating:

Cell Checks

Cell Checks
If the cell fails when you first begin
to use the analyzer, it is probably a
leak in the sensor plumbing or an
improper calibration gas setup, and
not a problem with the cell itself.
Loss / Inadequate AC Voltage to the Sensor
Measure the AC voltage to the backplane board at J4, Pins 1
and 2. Ensure that this voltage is sufficient.
Check the measurement technique used by the volt meter
(for example, RMS, average, peak, etc.). Specifications are
based on RMS measurements.
Open Furnace
Disconnect power to the analyzer. With an Ohm meter, mea-
sure across TB1, Pins 1 and 2 (both labeled AC on connec-
tion) on the backplane board. The resistance of the furnace
should be between 42.75 and 47.25 at room temperature.
Add 5% if the furnace is still hot.
If the furnace resistance is not within allowable tolerances, replace
the furnace.
Loss of AC Power to the Furnace
With line voltage present, check the voltage at terminals TB1
Pins 1 and 2 on the backplane board. (The voltage at termi-
nals TB1, Pins 1 and 2 will be either on or pulsating on and
off.)
Disconnect power and check the furnace resistance. If no
voltage is present at terminals TB1, Pins 1 and 2 on the back-
plane board, check for the DC furnace drive signal at the top
of resistor R4 and the anode side (side opposite the stripe)
of diode D1 on the backplane board.. The furnace drive is a
15 VDC pulse train and depending on the duty cycle of the
pulse train, the measured voltage will be between 4 and 15
VDC. If this furnace signal is present and you have no voltage at
terminals TB1, Pins 1 and 2, replace the backplane board.
If your analyzer doesn't respond properly to the calibration
gas, then it may be a problem with the cell. Before replacing
the cell, put the analyzer through a thermal calibration. If
this does not work, check the following:
•Are the gases at proper flow rate and pressure?
•Is there a leak or plugged plumbing in the inlet
sample line?
•Is the cell is hot enough?
If this does not solve the problem, replace the cell and run another
thermal calibration and a regular calibration after the thermal
calibration.
Error Messages & Troubleshooting
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