Teledyne 9060 - Zirconium oxide flue gas oxygen analyzer User Manual

Page 43

9060-Zirconia

Analyser

3.26 CONNECTING A PRESSURE TRANSDUCER

If the process gas pressure varies more than 4” WG and therefore requires dynamic
compensation, connect a pressure transducer as shown below. Place the link on LK1 in
the 4-20mA position, this connects an on-board 47

Ω resistor to terminals 8 & 9. A

pressure change of 4” WG will cause an oxygen error of about 1% of the oxygen reading.

Pressure Transducer Connection

There are no adjustments for the zero or span of the pressure transducer input and the
pressure cannot be displayed on the lower line. However the input calibration can be
checked with the following procedure.

Note: This procedure will check that the 4-20mA input will transfer correctly to an oxygen
value that is correctly compensated for pressure. The zero and full scale pressure range
of the transducer does not have to be used for the calibration. Because the scaling is
manipulated digitally, the scale can be changed to suit the pressure transducer after the
calibration.

1. Configure the set-up options as below –

34. Flue Pressure Setup- “Variable Input”
35. Flue Pressure Input Zero Value- 0 mb
36. Flue Pressure Input Span Value-

1000 mb

2. Connect a 4-20mA generator to the input terminals 8 & 9. Make sure that the 47 ohm

resistor is across the input terminals 8 & 9.

3. Connect either an oxygen probe or a mV generator to simulate 2% oxygen. This will

require 50.26mV between terminals 1 (+) and 2 (-), and 29mV between terminals 3 (+)
and 4 (-). Adjust the 29mV until the transmitter reads 720

°C when selected on the

lower line.

4. Set the 4-20mA generator to 4mA. The transmitter should read 2.0% oxygen.
5. Set the 4-20mA generator to 20mA. The transmitter should read 1.00% oxygen.

If the oxygen values do not read as indicated in numbers 4 and 5 above, check –
(a) The set-up items 34, 35 and 36 are set as stated in number 1.
(b) The polarity of the input signal.
(c) The oxygen level with the 4-20mA generator disconnected. It should be 2.0%.