Ametek TM2000 Pro, User Manual, Page: 116 / 148

6-8 | TM2000 Oxygen Analyzer
Calibration Gas Time
Inadequate
If you are having problems running
an auto calibration, you may not
have allowed the calibration gases
enough time to flow through the
sensor and stabilize.
Select the Cal Gas Duration option
from the Calibrate/Set Cal Timers
menu to set calibration gas times
.
To correct this problem:
Select the Inject Cal Gas option from the Calibrate Key menu.
Turn on each calibration gas and determine how long it takes for
each gas to stabilize on the control unit display.
Add a one-minute buffer to each of these times.
Make sure the cylinder regulators are set to correct pressure.
See the Flow Section of the System Interconnect Drawing for
the system flow and pressure requirements—this drawing is includ -
ed with your Installation package.
If performing a manual calibration, wait for the reading to stabilize on the display before switching to the next calibration
gas.
AC Power Checks
Loss / Inadequate AC Voltage to the Sensor
Measure the AC voltage to the sensor board at terminals L1 and
L2. 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.
Furnace Checks
Open Furnace
Disconnect power to the control unit and the sensor. With an Ohm
meter, measure across terminals “R” and “S” on the sensor board.
The resistance of the furnace should be 32 Ohms (+/- 10%) at
room temperature. Add 5% if the furnace is still hot.
If the furnace resistance is not within allowable tolerances, re-
place the furnace.
Verify the correct line voltage at L1
and L2 of the sensor board.
Loss of AC Power to the Furnace
With line voltage present, check the voltage at terminals R and
S on the sensor board. (The voltage at terminals R and S will be
either on or pulsating on and off.)
If voltage is present but system is
not heating:
Disconnect power and check the furnace resistance. If no voltage
is present at terminals R and S on the sensor board, check for the
DC furnace drive signal at terminals 3 (+) and 4 (-) at the sensor
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, LED DS1
is on, and you have no voltage at terminals R and S, replace the
sensor board.
If the furnace drive signal is not
present, check the interconnecting
wiring.
If the interconnecting wiring is correct, check across FURNACE
and 15V COM on the control unit wiring card for the furnace
drive signal.
If the signal is not present, check fuse F1 on the wiring card.
If this fuse is OK replace the control unit power supply/keypad
module.
If this fuse in not OK, replace the fuse (1/4 amp, 125 volts).
Check the interconnecting wiring for short circuits before reapplying power to the control unit.