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Preventive Maintenance
Temperature Sensors
Temperature Sensors
5-4
Model 5030 SHARP Monitor Instruction Manual
Typically it is recommended by the USEPA to visit the monitoring site
biweekly to perform a flow check for control charting purposes. Flow audits
can be done once per quarter. If the flow rate of the Model 5030 SHARP
does not deviate by more than ±5% of the auditing standard then no
calibration is required except for an annual calibration. A drifting control
chart from biweekly flow checks can define for the user what the calibration
frequency may be for the instrument and if there is any sensor drift.
However, the Model 5030 has been designed to hold a valid calibration for
up to one year.
Please be cautious in choosing flow standards in the field. Typically bubble
flow meters and dry piston meters should be limited to laboratory use and
are not recommended by Thermo Fisher Scientific as an appropriate flow
meter for field conditions. Thermo Fisher Scientific recommends the use of
a venturi-style flow meter.
Four temperature sensors are included in the Model 5030 SHARP:
•
T1 ambient sensor
•
T2 sample sensor (located inside the beta attenuation chamber)
•
T3 flow sensor (which measures the temperature at the subsonic orifice)
•
T4 heater sensor (located on the external heater wall)
The measuring range of these temperature sensors is -22 to 158
70
C), however the Model 5030 SHARP is rated for a temperature range of
°
-22 to 140
F (-20 to 60
°
temperature range of 0-100
Although the Model 5030 SHARP should hold a valid calibration for up to
one year, typically it is recommended by the USEPA to visit the monitoring
site biweekly to perform a flow check for control charting. Should an error
in the flow check be significant (>7%), the error may be caused by one of
the temperature sensors. It would also be beneficial to control chart the
temperature sensors with each site visit. Furthermore, temperature sensor
audits can be done once per quarter. If any temperature sensor does not
agree within ±3.6
F(±2
°
required in addition to an annual calibration. A drifting control chart from
biweekly checks can define for the user what the calibration frequency may
be for the instrument and if there is any persistent sensor drift. Should a
temperature sensor need to be replaced, reference the "Servicing" chapter.
C). The T4 Heater Sensor is rated for a
°
C.
°
C) of the auditing standard then a calibration is
°
F (-30 to
°
Thermo Fisher Scientific
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