envea STACK 710, Руководство пользователя

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STACK 710 5 Periodic Mode of Operation
ENVEA UK Ltd
(PC-000878-MA Issue 7, December 2021)
43
instrument at an opacity other than 100%, insert a filter into the slot in the
calibration unit, close the Transceiver on its hinges and apply the clips.
Press . The hourglass is displayed while the instrument waits for the
readings to settle.
Test Filter Opacity is displayed and the value is pre-set to 100%. If the
Transceiver was pointed into free space, or if the beam was completely blocked,
press . If a calibrated filter was used, set the filter's opacity with the
and arrows and press .
Zero Check is displayed while the instrument deploys and checks the Zero
Reflector.
Span Check is displayed while the instrument deploys and checks the
Upscale Filter. During this time, the calibration constants X and C values are
displayed for use by Service Engineers.
The hourglass is displayed while the instrument retracts the Zero Reflector
and the Upscale Filter.
When the hourglass disappears, the Clear Stack Calibration is complete.
5.4 Gravimetric Calibration (Isokinetic Calibration)
The STACK 710 measures the opacity of dust and smoke emissions. As explained
in the Reference section of the manual, this may be converted to Dust Density
using calibration constants. To determine these calibration constants, it is
necessary to collect and weigh samples of the particulate matter from the flue
gases. This procedure must be carried out in accordance with relevant USEPA
Methods or CEN or ISO Standards. It is generally known as Gravimetric or
Isokinetic Sampling.
STACK 710 provides a facility to simplify the collection of readings during
Gravimetric Calibration.
Press
Unlock is displayed, press
Use the and arrows until the Supervisor code (Default: 10) is displayed
and press
Use the and arrows to select Calibration and press .