Teledyne 300P - Percent oxygen analyzer - Manual (Page 12)

TeledyneAnalytical Instruments 3-2
3 Operation 3 Operation 3 Operation 3 Operation 3 Operation Model 300P
2. Connect the 2-wire shielded cable to the three terminal barrier
strip.
3. Replace the cover and screws.
3.2 Calibration
The calibration process consists of:
• Installing a milliammeter in series with the output signal as
described below
• Setting the electronic zero level
• Setting the span
Setting the zero and span of the transmitter requires adjustment of two
potentiometers (Pl and P2) located on the PC board inside the transmitter box.
NOTE: If the analyzer has more than one range, the selector switch should be
set to “B” (0-21%) during calibration and “A” during measurement
operations.
The Transmitter can be calibrated using either AIR or SPAN GAS.
Both methods are accomplished by adjusting two potentiometers (ZERO and
SPAN) located on the PC board inside the transmitter box.
Procedure:
1. Remove the junction box cover and remove the incoming wire
from terminal 2 of the barrier strip.
2. Connect a milliammeter in series between this wire and terminal
2.
3.2.1 Installing the Milliammeter
3. Remove the junction box cover and remove the incoming wire
from terminal 2 of the barrier strip.
4. Connect a milliammeter in series between this wire and terminal
2.
3.2.2 Setting the Electronic Zero Potentiometer (P2)5. Open
the transmitter box door and remove the Micro-Fuel Cell. Adjust P2 for a
meter reading of 4.00 +/- 0.01 mA.
6. Replace the Micro-Fuel Cell. Allow the reading to drop to a
stable low level (dependent upon the length of time that the
Micro-Fuel Cell was unshorted).