Manual calibration with zero/span valves – Teledyne 9110TH - Nitrogen Oxides Analyzer User Manual

Page 198

Model 9110TH NOx Analyzer

Calibration Procedures

Teledyne Analytical Instruments

178

5.5. MANUAL CALIBRATION WITH ZERO/SPAN VALVES

Zero and Span calibrations using the Zero/Span Valve option are similar to that
described in Section 7.2, except that:

 Zero air and span gas is supplied to the analyzer through the zero gas and

span gas inlets rather than through the sample inlet.

 The zero and cal operations are initiated directly and independently with

dedicated keys (CALZ & CALS)

If both available DAS parameters for a specific gas type are being reported via the
instruments analog outputs e.g. NXCNC1 and NXCNC2, separate calibrations should
be carried out for each parameter.

 Use the LOW button when calibrating for NXCNC1

 Use the HIGH button when calibrating for NXCNC2.

See Section 4.13.4 for more information on analog output reporting ranges

STEP ONE:

Connect the sources of zero air and span gas to the respective ports on the rear panel as
shown below.

VENT

here if input

is pressurized

Source of

SAMPLE Gas

PUMP

Instrument

Chassis

Sample

Exhaust

Span Point

Zero Air

Cal

ted

Span

onc

tra

tio

Filter

External Zero

Air Scrubbe

VENT if not

vented at
calibrator

MODEL T700

Gas Dilution

Calibrator

MODEL 701

Zero Gas

Generator

Figure 5-4:

Pneumatic Connections–With Zero/Span Valve Option (50)