User manual

OPERATING INSTRUCTION
Technical changes reserved
0141 0315-199 09/2014
Humidity reference cells
for adjustment of humidity sensors
Please read the following precautions carefully before putting into operation! The symbols used in the operating manual are to make you
careful, before hand, regarding safety considerations and dangers. But all these symbols cannot substitute the text of the associated safety
instructions in any way. Therefore, the instructions should also be always read completely!
This symbol indicates likely danger for persons, material or environment. The information provided in the associated text should be duly
followed to avoid any kind of risk.
This symbol refers to important application notes and tips, which are necessary for successful working and should to be absolutely follo
wed to ensure good results.
Most of the used salt solutions are not physiological harmful, and hence, are not dangerous products as per denition provided in the gui-
delines 67/548/EWG. Please take care of the following special precautions: CAUTION ! Please note that Lithium chloride (LiCl) is injurious
to health (harmful). Avoid physical contact and contact with clothes!
Follow the respective rules and regulations. Keep the reference cells out of reach of children. Immediately separate out the leaking cells.
Spilt out liquid should be removed. In case of contact with eye or skin, immediately wash with plenty of water. Consult physician if swallo-
wed inadvertently. The disposal in laboratory is to done as normally applicable for inorganic salt solutions. Defective cells can be sent to us
for free of charge disposal or repairs. You can fhe respective material safety data sheets of the salt llings on the CD.
The B+B Thermo-Technik GmbH humidity sensor is produced through a sophisticated calibration procedure. A further adjustment of newly
supplied sensors isn’t reasonable, since higher accuracy can not be further achieved.
The sensors, for which a calibration certicate has been issued in accordance with ISO- or DKD-Calibration standards, may be only cross
checked but must not be adjusted again, otherwise the calibration certicate expires!
Reference cells are not considered to use as a standard of humidity values. For verication, the cells should be checked at regular intervals
with respect to a certied reference device. The requirement as per the application should also be cross checked through an additional
comparative measurement with a certied reference device.
The humidity reference cells are meant for checking and adjustment of humidity sensors. In the test chamber of the cell, a saturated salt
solution is created with a dened level of relative humidity. The accuracy of humidity value in the reference cells is determined by the physical
and chemical properties. Under laboratory conditions, an accuracy of ±1 % RH can be achieved.
The test chamber is separated from the salt solution by a diaphragm so that the sensor under test is protected against contamination by the
solution.
The humidity reference cells always work correctly irrespective of their placement and can be used in horizontal positions.
Owing to the high accuracy and simple checking method, the cells are also ideally suitable for checking and adjustment of hygrometers.
The complete humidity range of 11,3 % to 75,4 % RH (other humiditys on request) is covered through different models which differ in salt
content. For checking purposes, at least one cell is required. For adjustment of sensors, at least two different cells (e.g. 11,3 % RH and 75,4
% RH) should be used. The values shall be well apart within the preferred measuring range in order to achieve good adjustment results
over the complete applicable range.
For simple adaptation of cells with probes, they can be tted either with G½“ threads or with M20 x 1.5 mm threads with the connection
arrangement provided together. The mounting arrangement provides airtight connection with the probe (D= 10 ... 14 mm).
Delivery of 1 to 3 pieces in styrofoam packing.
!
!
!
1. General dangers and precautions
1.1 Dangers and precautions about the salt solutions
1.2 Important application notes
2. General description
!
B+B Thermo-Technik GmbH | Heinrich-Hertz-Straße 4 | D-78166 Donaueschingen
Fon [phone] | Fax [phone] | [e-mail] | bb-sensors.com
3 / 10