Lufft A1-SDI User manual
Manual A1-Sensors English
Page 1 of 29
A1-SDI
Sensors
Status V2 (11/2005)
Manual A1-Sensors English
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1 Read before using
• Before using the sensors, please read
the operating manual carefully and
follow the instructions in every detail.
• Never carry out measurements on live electrical parts.
• Pay attention to the measurement ranges of the sensors
(overheating can cause destruction).
• Only carry out sensor calibration with the aid of a suitable
reference device.
• The sensors generally require an adjustment period of
several minutes when changing to a location with a
different climate.
Manual A1-Sensors English
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Designated use:
• The sensors must only be operated within the range of the
specified technical data.
• The sensors must only be used under the conditions and
for the purposes for which they were designed.
• Operating safety can no longer be guaranteed if the
sensors are modified or reconstructed.
Manual A1-Sensors English
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2 General
In addition to the standard functions of the lower menu on the
A1-SDI, such as UNIT1, UNIT2, TIME, etc. (see A1-SDI Manual),
there are also the arrow menus F1...F4. Dependent on the
sensor, these arrows are used differently and may be assigned
to both a function and a unit. The table on the following page
provides a summary of the assignments. The list only includes
sensors for which at least one arrow menu has been assigned.
Manual A1-Sensors English
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Sensor F1 F2 F3 F4
T/H: 9130.52 g/kg gr/lb Pabs
T/H: 9130.53 g/kg gr/lb Pabs
T/HOIL: 9130.60 Oil para.
A
Oil para.
B
Aw value
V/T: 6120.51 fpm Pabs
V/T:6120.52 fpm Pabs
V/T: 6120.53 fpm Pabs
Manual A1-Sensors English
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3 PT100 Temperature Sensors
PT100 Plunge Sensor - 3120.51
• Application: Temperature measurement in solid, liquid and
powdery media
• Response time: 10 seconds
• Measurement variable: Temperature [°C/°F]
• Calibration: Single point calibration (see A1-SDI Manual)
• The sensor is recognized automatically by the A1-SDI
Manual A1-Sensors English
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PT100 Plunge sensors - 3120.52 and 3120.54
• Application: Temperature measurement in gaseous, liquid
and powdery media
• Response time: 10 seconds
• Measurement variable: Temperature [°C/°F]
• Calibration: Single point calibration (see A1-SDI Manual)
• The sensor is recognized automatically by the A1-SDI
Manual A1-Sensors English
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PT100 Plunge Sensor - 120.55
• Application: Temperature measurement in solid, liquid and
powdery foods
• Response time: 10 seconds
• Measurement variable: Temperature [°C/°F]
• Calibration: Single point calibration (see A1-SDI Manual)
• The sensor is recognized automatically by the A1-SDI
Manual A1-Sensors English
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4 Temperature/Humidity Sensors
Heating, Air Conditioning Sensor & Ventilating (HACV) - 9130.54
• Application: HACV humidity and temperature measurement
• Response time: ≤7 seconds
• Measurement variables:
Unit 1: Temperature [°C/°F]
Unit 2: Relative humidity [%], absolute humidity
[g/m³], dewpoint temperature [°C/°F]
• Calibration: Single/two point calibration (see A1-SDI
Manual)
Manual A1-Sensors English
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F1 F2 F3 F4
Unit
g/kg
Unit
gr/lb
Input
Pabs
Functions of F1...F4
Temperature/Humidity Sensor with 4mm Ø- 9130.52
• Application: Humidity and temperature measurement in
restricted space conditions, determination of equilibrium
humidity in boreholes
• Response time: ≤15 seconds
• Measurement variables: Unit 1: Temperature [°C/°F]
Unit 2: Relative humidity [%],
absolute humidity [g/m³], dewpoint temperature [°C/°F],
mixing ratio [g/kg, gr/lb]
• Calibration: Single/two point calibration (see A1-SDI
Manual)
Manual A1-Sensors English
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F1 F2 F3 F4
Unit
g/kg
Unit
gr/lb
Input
Pabs
Functions of F1...F4
High Temperature/Humidity Sensor (-40°C...180°C) - 9130.53
• Application: Humidity and temperature measurement in
process technology
• Response time: ≤30 seconds
• Measurement variables:
Unit 1: Temperature [°C/°F]
Unit 2: Relative humidity [%], absolute humidity
[g/m³], dewpoint temperature [°C/°F],
mixing ratio [g/kg, gr/lb]
• Calibration: Single/two point calibration (see A1-SDI
Manual)
Manual A1-Sensors English
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H/[m] p[hPa=mbar] Correction Factor
0 1013.25 1.000
50 1006.94 1.006
100 1000.67 1.013
200 988.25 1.025
300 975.98 1.038
500 951.9 1.064
800 916.88 1.105
Pressure Dependence of the Mixing Ratio:
In order to precisely determine the mixing ratio in g/kg or gr/lb
at different heights (h) above sea level, the effect of air
pressure on the measurement can be corrected using the
barometric height formula.
In practice, the mixing ratio is multiplied by a corresponding
correction factor (quotient from average air pressure / actual
air pressure) for this purpose.
Manual A1-Sensors English
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h/[m] p[hPa=mbar] Correction Factor
1000 894.26 1.133
1500 840.11 1.206
2000 789.24 1.284
3000 696.56 1.455
4000 614.76 1.648
5000 542.57 1.868
10000 290.53 3.488
The calculated correction factor can be consulted by means
of the special function - Pabs – in the measuring instrument.
Note: If the actual air pressure is not known, reference can be
made to average values related to sea level, in order to
minimise the pressure effect (see table opposite).
Manual A1-Sensors English
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F1 F2 F3 F4
Unit
fpm
Input
Pabs
Functions of F1...F4
5 Flow Sensors
Flow Sensor 6mm / 0...2m/s - 6120.51
• Application: Flow measurement where high accuracy is
demanded or in restricted space conditions
• Response time: ≤1.5 seconds
• Measurement variables:
Unit 1: Flow [m/s / fpm]
Unit 2: Temperature [°C/°F]
Manual A1-Sensors English
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F1 F2 F3 F4
Unit
fpm
Input
Pabs
Functions of F1...F4
Flow Sensor 6mm / 0...20 m/s -6120.52
• Application: Flow measurement where high accuracy is
demanded or in restricted space conditions
• Response time: ≤1.5 seconds
• Measurement variables:
Unit 1: Flow [m/s / fpm]
Unit 2: Temperature [°C/°F]
Manual A1-Sensors English
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F1 F2 F3 F4
Unit
fpm
Input
Pabs
Functions of F1...F4
Flow Sensor 12mm / 0...20 m/s - 6120.53
• Application: Low cost flow measurement in the HVAC
sector
• Response time: ≤1.5 seconds
• Measurement variables:
Unit 1: Flow [m/s / fpm]
Unit 2: Temperature [°C/°F]
Manual A1-Sensors English
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CAL1 initiates single point flow calibration. The flow set-point
(Unit 1) is shown on the upper section of the display. A
gradient correction factor, which may be changed to calibrate
the flow between 0.8 and 1.2 in steps of 0.001, is shown on
the lower section of the display. Set the gradient correction
factor to 1.000 to obtain the factory settings.
Manual A1-Sensors English
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The calibration value should be > 50% of the upper end value
of the sensor measurement range. Select the direction of flow
onto the probe from the straight handle side when calibrating.
Directional effect:
The hand-held flow sensors have only a low directional effect.
The measurement error resulting from distorted positioning is
less than 3% of the measurement in the range of +/-15° (α).
Manual A1-Sensors English
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CAL2 initiates single point temperature calibration. The
temperature set-point (Unit 2) is shown on the lower section
of the display. The temperature offset, which may be changed
to calibrate by +/-10°C (+/-18°F) in steps of 0.01°C, is shown
on the upper section of the display. Set the temperature offset
to 0.00°C to obtain the factory settings.
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