T
HERMO
F
ISHER
S
CIENTIFIC
S
S
S
S
S
ECTION
ECTION
ECTION
ECTION
ECTION
4
4
4
4
4
S
CREENS
AND
S
ETTINGS
O
PERATING
G
UIDE
, TEOM 1405
4-29
•
Frequency gate time.
The basis of mass change is raw frequency. Raw
frequency is calculated by comparing cycle counts of a highly stable 10
megahertz (Mhz) clock to the cycle counts of the oscillating tapered
element (TE). The gate time controls how often the comparisons are
made. To adjust the setpoint, select the button to display the keypad. DO
NOT adjust this value without contacting Thermo Scientific.
•
Frequency wait time.
This field contains the time interval (sec) after a valve
position change before the instrument begins collecting frequency data.
The default setting is 90 seconds. To adjust the setpoint, select the button
to display the keypad. DO NOT adjust this value without contacting
Thermo Scientific.
•
Mass averaging time.
This field contains the time interval (sec) at which the
monitor switches the sample between the base mode and the reference
mode (Section 1). To adjust the setpoint, select the button to display the
keypad. DO NOT adjust this value without contacting Thermo Scientific.
•
XX-Hr MC.
This field contains the XX-Hr MC parameter. This value gives
the user a choice of averaging times (hours) shown on the Main screen,
following the 1-hour mass concentration average. The default value for
this parameter is “8,” which causes the monitor to compute 8-hour
averages. The user can set an averaging time of any whole hour greater than
1 hour for this parameter. To adjust the setpoint, select the button to
display the keypad.
Select the
Mass Transducer K0 Constants
button to display the Mass
Transducer K0 Constants screen.
The Mass Transducer K0 Constants screen contains the following
information:
•
TEOM K0
. This field contains the calibration constant, K
0
(K0) (Section
1), for the TEOM.
Note.
Note.
Note.
Note.
Note. You can find your monitor’s K0 number on the label located near
the mass transducer. Each TEOM 1405 monitor has a unique K0 for the
TEOM in the unit. The constant listed in the Mass Transducer K0
Constants screen must match the value shown on the label near the mass
transducer, or the mass concentration data will be incorrect. To adjust
the value, select the button to display the keypad.
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Содержание TEOM 1405
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