Datasheet

DATA SHEET
Technical changes reserved
0141 0316-303 09/2014
Humidity-Reference cells
REFZ
DescriptionDescription
Technical data
Humidity reference cells
Humidity value
(at nominal temperature 23°C)
Salt lling
11,3% RH = LiCl
22,8% RH = C
2
H
3
KO
2
32,9% RH = MgCl
2
43,2% RH = K
2
CO
3
53,5% RH = Mg(NO
3
)
2
75,4% RH = NaCl
84,7% RH = KCL
94,0% RH = KNO
3
97,4% RH = K
2
SO
4
Typical accuracy ± 3 % RH at 23 °C
Nominal temperature 23 °C
Application temperature
(Small Temperature cycle)
20 ... 40 °C
Storage temperature 0 ... 60 °C
Operating pressure Atmospheric ambient pressure
Membrane Polyethylene-Sinter lter, pore
width 3 μm
Life Almost indenite
Material Polyethylene, Acryl glass, ABS
Cell dimensions Ø 40 x 105 mm (with cover)
Characteristic features
• Reference cells for capacitive humidity probes
• High accuracy due to salt of Quality level “Analytical reagent“
• Different models with salt lling of 11,3 % RH to 97,4 % RH
• High quality diaphragm for contact less checking of measuring
probes
• Transparent housing for visual inspection of saturation condition
• Long life, rellable
• Alternatively available with G1/2“-thread or M20 x 1.5 mm con-
nection thread
Areas of application
• Calibration of hygrometers and humidity probes
• Dened humidity storage of probes
• Humidication cell for research and experimental purposes
Features
The humidity reference cells are meant for checking and adjustment
of capacitive type humidity probes as well as for use as humidity
standards in scientic applications. In the test chamber of the cell, a
saturated salt solution is created with a dened level of relative humidi-
ty. The accuracy of humidity value in the reference cells is determined
by the physiochemical properties. Under laboratory conditions, an
accuracy of +/-1% RH can be achieved. The test chamber is separa-
ted from the solution by a diaphragm so that the sensor under test is
protected against contamination by the solution. The test containers
always work correctly even if held upside down and can be used in
both laid down or overhead mounted positions. The complete humidity
range of 11,3 % to 97,4 % RH is covered through different models,
which differ in their salt content. For checking purposes, at least one
cell is required. For adjustment of sensors, at least two different cells
(e.g. 32,9 % RH and 75,4 % RH) should be used. Complete sets are
availablefor the most common adjustment points. For simple adaption
of the probe, the reference cell is provided with a gland of G1/2“-
threads or M20 x 1.5 mm thread for thread mounting. The threaded
mounting ensures airtight connection with theprobe (Ø 10 ... 14 mm).
You have to use the calibration container to protect the reference
cells against uctuating environmental inuences.
B+B Thermo-Technik GmbH | Heinrich-Hertz-Straße 4 | D-78166 Donaueschingen
Fon [phone] | Fax [phone] | [e-mail] | bb-sensors.com
1 / 3