datasheet - Testo

datasheet - Testo
Pressure Dew Point Probe
0636.9840 / 0636.9841
Application Information
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Contents
Instrument description ...............................................................3
User instructions ........................................................................4
Safety instructions .....................................................................5
Folding ferrite .............................................................................5
Operating instructions ...............................................................6
The pressure dew point probe................................................6
Measuring ...................................................................................7
Maintenance ...............................................................................8
Control and calibration options .................................................9
Technical data ...........................................................................12
Warranty ...............................................................................12
Ordering data ............................................................................13
Appendix A ................................................................................14
Necessary pressure dew point values tpd ...............................14
Appendix B ................................................................................15
Dew point graph for compressed air......................................15
The conformity certificate confirms that this product fulfills the guidelines in
accordance with 2004/108/EEC.
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Instrument description
PTFE sintered cap
Temperature sensor
Humidity sensor
Internal thread
Standard plug-in nipple
Plug-in head
connection cable
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Valve
Measuring chamber
Humidity/temperature
probe
Protective sleeve
Plug-in head
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User instructions
The two pressure dew point probes guarantee quick
and accurate dew point measurement.
The probe was developed in cooperation with a world
market leader in the compressed air engineering sector.
The standard probe 0636.9840 is sufficient for most
measurements in compressed-air piping (e.g. refrigeration dryers in the range from 0 to 2 °C tpd). The precision probe 0636.9841 is the ideal probe for highly
accurate measurements in the remaining humidity
range (e.g. in adsorption dryers to
-50 °C tpd).
The pressure dew point tpd is the temperature at which
compressed air reaches the saturation state (100%
RH). This value is an important criteria for the perfect
running of the compressed air plant.
The probe is connected to the compressed air system
via a standard plug-in connector (G1/4ý internal thread
to ISO 228-1) or via a screw-on adapter for measurements at test points. If required other standard plug-in
connectors with thread G 1/4ý can be screwed into
measuring chamber.
The sensor is positioned in the flow of compressed air
being measured, for the duration of the measurement.
The probes can be used, without a measuring chamber, in accordance with the Instruction Manual for the
testo testo 645, 445 instruments.
By connecting the probe to testo testo 645, 445 the
user has a portable, mains independent measuring
system. The large display enables the display of the
relative humidity or the dew point with the temperature.
4
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Safety instructions
Read
before using the instrument
Please read the Instruction Manual belonging to the measuring instrument.
Do not exceed the permissible pressure range.
Observe the measuring range of the sensor.
Overheating can destroy the probe.
Observe the permissible storage and transport temperature
as well as the permissible operating temperature
(e.g. protect the measuring instrument from direct sunlight).
If the instrument is opened, improperly handled of if force is applied,
the warranty will no longer be valid.
Folding ferrite
Placeholder:
Klapp-Ferrit
Heavy electromagnetic load (interfering irradiation from external sources) can lead to incorrect
measurements. With the enclosed folding ferrite the probe complies with the guidelines in
accordance with 2004/108/EEC .
Attach the folding-ferrite
to the connection
cable:
Instrument
300mm
plug
The cable can also be used for other Testo probes.
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Operating instructions
The pressure dew point probe
Place the measuring chamber on the humidity probe
adapter and screw on tightly by hand.
Valve to
control the
air flow rate
The humidity probe can also be used without the
Make sure that the measuring chamber and
the valve are not dirty.
Using the valve you are able to control the air
flow rate which flows off to get an optimized
response time with the humidity sensor
PTFE sintered cap, in which case the response times
are shorter. However, the probes can become dirty or
damaged during assembly or application.
If possible always use a sintered cap with the probe. A
metal protection cage (Order no. 0554.0755) can be
used with absolute oil-free compressed air.
Connect the probe to the instrument
In order to obtain a real measuring value, let compressed air escape from the outlet for about 10 seconds.
Connect the humidity probe to the compressed air
plant. Compressed air flows out of the capillary wire
(shortening of the response times).
ss
sss
ss
ss
ss
s
ss
s s ss
The reduction of pressure at the outlet leads to a physical reduction in the pressure dew point value.
See the table in appendix B.
6
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Measuring
Please read the instrument instruction manual
before the switching on the instrument, in
order to avoid incorrect measuring results and
damage to the instrument.
The storage of the humidity probe in areas with
temperature and humidity values which differ considerably from those of the compressed air being
measured, and dirty sensors or sintered caps
increase the response times.
The response time is 1 to 5 minutes (typically
2 minutes). Wait until the measured values are
stable (approx. 60 s without a change in the measured values).
Display testo 645/445
MEASURING LOCATION
HOLD
41,3
%rF
25,1
°C
11,1
td°C
AVERAGE
MAX/MIN
-22.9
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¡C
td
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Maintenance
A robust, long-term stable humidity sensor is located
in the probe head.
Depending on the application and dirt which has
gathered, we recommend a quarterly to yearly control
with our 0554.0660 control and calibration set. See
the instructions on page 10.
Clean dirty sensors with alcohol (isopropanol) or distilled water.
Unscrew the measuring chamber and the PTFE sintered cap.
Dip the sensor in the alcohol, rinse in distilled water
and then leave to dry in the air.
Do not touch or knock the sensor.
Put the PTFE sintered cap back on and screw tightly.
Faulty sensors can be replaced, please contact our
service department.
Dirty PTFE sintered caps can also be cleaned in
alcohol or in distilled water. Impurities can be blown
out with compressed air. Always blow out the cap
from the inside.
Dirty measuring chambers can also be cleaned in
alcohol or in distilled water, or purged with
compressed air
Should the measuring chamber be faulty, please contact our service department.
8
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Control and calibration options
The control and calibration set (Order no.: 0554.0660)
is used to control and calibrate humidity probes. The
set consists of two special containers.
With the aid of different saline solutions, air mixtures
with defined relative humidities are produced (for additional information see the Instruction Manual “Control
and calibration set for humidity sensors”).
As part of the accreditation as a calibration laboratory
for the parameters “Relative humidity” and “Dew
point” the values for the relative humidity over the
saturated lithium chloride (LiCl) and sodium chloride
(NaCl) solutions were newly specified at testo.
LiCl 11.3%RH, NaCl 75.3%RH
at rated temperature +25 °C
These improved values also apply to all of the control
and calibration sets already delivered. Ignore the values specified up to now.
Temperature dependencies
Lithium chloride
Temperature
10 °C
15 °C
20 °C
LiCl
Average
11.29 %
11.30 %
11.31 %
Tolerance
± 0.41 %
± 0.35 %
± 0.31 %
25 °C
11.30 %
± 0.27 %
NaCl
Average
75.67 %
75.61 %
75.47 %
75.29 %
75.09 %
Tolerance
± 0.22 %
± 0.18 %
± 0.14 %
± 0.12 %
± 0.11 %
Sodium chloride
Temperature
10 °C
15 °C
20 °C
25 °C
30 °C
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Control and calibration options
General information
The humdity probes 0636.9840 and 0636.9841
undergo a comprehensive calibration procedure at
testo. Before control and calibration, the probes must
be stored at a constant temperature (+20 to +30 °C)
for approximately 12 hours. The minimum adjustment
time is 15 minutes in the test container with screwed
in probes.
Control and/or calibration
Standard probe 0636.9840
P1
P2
- Carefully screw off the PTFE sintered cap
- Screw off the protective sleeve
- Screw the probe into the test container LiCl (11.3%)
- 15 minute adjustment time
- Control on the hand-held instrument display
- Calibrate, if necessary, by pressing
P1 = 11.3%RH ± 2%RH
- Screw out the probe from the LiCl test container
- Screw the probe into the NaCl (75.3%) test
container
- 15 minute adjustment time
- Control on the hand-held instrument display
- Calibrate, if necessary, by pressing
P2 = 75.3%RH ± 2%RH
- Screw out the probe from the NaCl test container
- Carefully screw on the PTFE sintered cap
- Screw on the protective sleeve tightly
Precision probe 0636.9841
Protective
sleeve
In addition to the standard calibration the precision
probe is subjected to a fine calibration in the factory at
-40 °C pressure dew point.
A control with the control and calibration set is possible. The salt containers are not suitable for calibrating
the precision probe. A precision calibration can only
be carried out at testo or with corresponding highly
accurate reference systems (dew point mirror measuring instruments for compressed air).
10
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Control and calibration options
Fine calibration
With the probes 0636.9840 and 0636.9841 you have
the option of a fine calibration on any pressure dew
point in the range -50 to +25 °C tpd at +25 °C (one
point calibration).
Note
A fine calibration is practical only if used with highly
accurate reference systems and if the appropriate
adjustment times are taken into consideration (at least
15 minutes). The probe 0636.9841 is already optimized in the factory for humidity measurement in compressed air systems.
m/s
Off
How to carry out a fine calibration
Off
On
- Screw off the protective sleeve
- Turn the switch right to “Offset”
- Mark down the measured values via P1 (Down)
- Mark up the measured values via P2 (Up)
The values set last on the hand-held instrument
display are saved.
Offset
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Abgleich
Calibration
Etalonnage
11,3%
(DOWN)
75,3%
(UP)
Factory setting
The set fine correction is inactive if the switch is turned
to the left (switch position “Calibration”).
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Technical data
Sensor: ........................................... testo® ceramic sensor
Measuring range:........................... 0 to 100 %RH,
Pressure dew point tpd: .................... -60 to +50 °C tpd
Pressure range: ............................. Overpressure to 15 bar
Accuracy, temperature:* ............... ±0.4 °C
Resolution: ..................................... 0.1 %RH / 0.1 °C
Temperature range: ....................... Probe: -20 to +50 °C
Instrument: 0 to +40 °C
Control point: ................................. 11.3 to 75.3%RH
Measuring air flow rate
at 6.0 bar overpressure: ................ 1,0 l/min factory set at
........................................................ delivery (relating to 0 bar,
........................................................ +20°C)
Response time: .............................. 1 to 5 min
typically 2 min
Storage/transport temperature: .... -20 to +70°C
Accuracy:
Pressure
dew point
in °C
5
0
-5
-10
-20
-30
-40
±0.9
Accuracy
in °C tpd
0636.9840 0636.9841
±1
±2
±3
±4
-
±0.8
±0.8
±0.9
±1
±2
±3
±4
* Accuracy referred to a rated temperature of +25 °C.
The Technical data applies in connection with the testo 600 /
601/650/400 measuring instrument.
Warranty
Pressure dew point probe ............... 1 year
Measuring chamber ......................... 1 year
If the instrument is opened, improperly handled or if force is applied,
the warranty will be no longer valid.
12
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Ordering data
Description ................................................. Order no.
Standard probe .......................................................
0636.9880.................................................................
Measuring chamber, Instruction Manual
Precision probe ...................................... 0636.9881
Measuring chamber, Instruction Manual
Plug-in head connection cable (1.5 mtr.)
for testo 445/645 .................................... 0430.0143
Plug-in head connection cable (5 mtr.)
for testo 445/645 .................................... 0430.0145
Measuring chamber ...............................................
0554.3303.................................................................
Humidity sensor...................................... 0420.0023
Temperature sensor ............................... 0420.1242
Humidity control and calibration set ........ 0554.0660
11.3%RH, 75.3%RH, Instruction Manual
PTFE sintered cap ................................. 0554.0756
Metal protection cage ............................ 0554.0755
Calibration certificate ............................. 0520.0306
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Appendix A
Necessary pressure dew point values tpd
Depending on the type of application, different requirements can be
made on the air quality.
As the speed of corrosion on steel surfaces increases rapidly above
approx. 50%RH, this value should never be exceeded.
Field of application
Factory air, internal pipes
Paint spraying
Instrument air
Sand blasting machine
Pneumatic tools
Pneumatic conveyor belt
Necessary pressure dew point values tpd
10 °C to -10 °C
10 °C to -25 °C
10 °C to -40 °C
5 °C to 0 °C
5 °C to -25 °C
5 °C to -60 °C
Transport vehicles (bus, etc.)
-13 °C to -33 °C
Cleaning of optical systems
Drying of electronic components
Factory air, external pipes
Chem. and pharmaceutical plants
-17 °C
-20 °C
-20 °C
-25 °C
to
to
to
to
-33 °C
-40 °C
-40 °C
-40 °C
The pressure dew point tpd is the temperature at which the compressed
air is fully saturated (100 %RH) .
14
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Appendix B
Dew point graph for compessed air
This graph gives information on the change in
the pressure dew point at pressure loss. A drop
in working pressure from 8 bar to 6 bar is used
as an example here. In this case the pressure
dew point is reduced from 10 °C to 5 °C.
The water content falls from 9 g/m3
to 7g/m3.
The values refer to an ambient
temperature of +25 °C.
100
70
70 65 60 55
40
30
20
50
45
40
10
70
4
50
45
15
3
55
20
5
65
60
25
7
30
35
25
0
20
-5
15
-1
0,5
30
2
0,7
6
1,0
35
10
0
0,4
6
-1
0,3
2
5
0
-2
0,2
Pressure
dew point
Drucktaupunkt
(°C(°C
td) td)
40
2
10
Grammes of water vapour per m33of humidity-saturated compressed air g
Gramm Wasserdampf je m feuchtigkeitsgesättigter Druckluft ( )
m3
50
0
-5
5
0
-2
-3
-10
0,1
AIR PRESSURE
LUFTDRUCK (bar) 1
(bar)
2
3
4
5
7
10
14
20
Betriebsüberdruck 0
1
2
3
4
6
9
13
19
Working pressure
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