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Pressure Dew Point Probe

0636.9835 / 0636.9836

Application Information en

99 Washington Street

Melrose, MA 02176

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

Contents

Probe description.......................................................................3

User instructions ........................................................................4

Safety instructions......................................................................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

Measuring instrument conforms with EN 50 081-1 + EN 50 082-1

Probe description

3

PTFE sintered cap

Humidity sensor

Temperature sensor

Standard plug-in nipple

Humidity/temperature

probe

Internal thread

Measuring chamber

Protective sleeve

valve

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 0636.9835 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 0636.9836 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 (G1/4” 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 1/4” 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 x35 instruments.

By connecting the probe to testo x35 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

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.

5

Operating instructions

The pressure dew point probe

Place the measuring chamber on the humidity probe

adapter and screw on tightly by hand.

The humidity probe can also be used without the 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).

6

Make sure that the measuring chamber and

the valve are not dirty.

The reduction of pressure at the outlet leads to a

physical reduction in the pressure dew point value.

See the table in appendix B.

s

s

s

s

s

s

s

s

s

s

s

s

s

s

s

s

s

s

Valve to

control the

air flow rate

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

Measuring

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).

7

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.

Please read the instrument instruction manual

before the switching on the instrument, in order

to avoid incorrect measuring results and

damage to the instrument.

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.

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

Do not touch or knock the sensor.

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.

These improved values also apply to all of the control

and calibration sets already delivered. Ignore the

values specified up to now.

9

LiCl 11.3%RH, NaCl 75.3%RH

at rated temperature +25 °C

Temperature dependencies

Lithium chloride

Temperature LiCl

Average Tolerance

10 °C 11.29 % ± 0.41 %

15 °C 11.30 % ± 0.35 %

20 °C 11.31 % ± 0.31 %

25 °C 11.30 % ± 0.27 %

30 °C 11.28 % ± 0.24 %

Sodium chloride

Temperature NaCl

Average Tolerance

10 °C 75.67 % ± 0.22 %

15 °C 75.61 % ± 0.18 %

20 °C 75.47 % ± 0.14 %

25 °C 75.29 % ± 0.12 %

30 °C 75.09 % ± 0.11 %

Control and calibration options

General information

The humdity probes 0636.9835 and 0636.9836

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 0636.9835

- 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 0636.9836

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

P1

P2

Protective

sleeve