PRODUCT DESCRIPTION
Normal Mode
USER'S GUIDE
Vaisala BAROCAP®
Barometer PTB110 Series
– Several pressure ranges
– Accuracy ±0.3 hPa at +20 °C
– Long-term stability ±0.1 hPa/year
– On/off control with external trigger
– Output voltage 0 … 2.5 or 0 … 5 VDC,
frequency output
– Current consumption less than 4 mA
– Mountable on a (35 mm wide) DIN rail
– NIST traceable (certificate included)
– BAROCAP
®
sensor
The PTB110 barometer is a micro controller based barometer
including a voltage or frequency output. The barometer can be
supplied with several pressure ranges. The output of the
barometer is a calibrated barometric pressure reading.
The barometer uses the Vaisala BAROCAP
capacitive sensor developed by Vaisala for barometric pressure
measurement applications. The BAROCAP® sensor is especially
designed for accurate and stable measurement of barometric
pressure.
®
Sensor, a silicon
INSTALLATION
The PTB110 barometer is intended to be installed indoors.
Installing outdoors requires a protecting enclosure. A DIN rail
mounting option enables the mounting of the barometer on a 35
mm wide standard DIN mounting rail.
The barometer should be installed in a vertical position with the
connectors pointing downwards to prevent accumulation of
condensated water
.
The device is in the normal mode when the power on
jumper is connected (see figure on the following page).
In the normal mode the barometer measures
continuously when powered-up.
Shutdown Mode
The device is in the shutdown mode when the power
on jumper is not connected.
In the shutdown mode, the barometer can be turned on
or off by switching the pin 1. The pin 1 is located at
the customer port, on the left edge of the screw
terminal.
NOTE The other jumpers inside the barometer are
set at the factory and they must not be
touched.
ELECTRICAL CONNECTIONS
The PTB110 barometer contains a screw terminal block located at
the customer port. The screw terminal includes the electrical
input/output pins presented in the table below.
Pins in screw terminal Description/Value
Pin 1: EXT_TRIG External trigger input
Pin 2: AGND Analog ground
Pin 3: GND Ground
Pin 4: SUPPLY Supply voltage
Pin 5: VOUT/FOUT Voltage output/
In the normal mode no connection to the Pin 1 EXT_TRIG is
recommended.
Pin 1 is used as a power on/off
switch in shutdown mode as
follows:
Power off 0 VDC
Power on 5 VDC
Frequency output
OPERATING MODES
The PTB110 barometer has two operating modes, the normal
and the shutdown mode. The factory setting is the normal mode
.
The barometer is protected against a reverse operating voltage.
Both grounds (AGND and GND) are in the same electrical
potential in the barometer. Both three-wire and four-wire
connections can be used. However, it is recommended to use the
four-wire connection, especially if the signal wires are long.
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The connections can be made as illustrated below.
−
INSERTING AND REMOVING THE COVER
ADJUSTMENT AND CALIBRATION
READING THE OUTPUT
The barometric pressure (P) can be calculated from the measured
output voltage (Uout) using a simple equation.
P
range
PP ⋅+=
low
U
where:
= Lower limit of the pressure range [hPa]
P
low
P
= Pressure full range [hPa]
range
= Voltage full range [V]
U
range
U
= Measured output voltage [V]
out
Example
Pressure range 500...1100 hPa
Voltage output 0...5 V
Measured output voltage 4 V
hPaP 9804
500 =⋅
NOTE The low end of the output voltage range of
In the frequency output 1 hPa equals 1 Hz.
U
range
+=
the barometer saturates at about 50 mV.
out
()
hPa
5001100
V
5
hPaV
The adjust buttons and the power on jumper are located inside
the barometer. In order to adjust the measurement, the plastic
cover of the barometer must be removed.
For safety reasons, turn off the power when opening the cover.
You can power off the device by pulling out the connector from
the customer port. Correspondingly, you can power on the
device by plugging the connector back into the customer port.
Removing the Cover
Stick a flat-end screwdriver between the cover and the metal
mounting plate. As you press the tool slightly, the cover will
open up.
Inserting the Cover
Place the short and solid side of the cover against the left edge of
the metal plate. Ensure that the metal clamps slide into the
hollows in the cover. Then press the cover against the metal
plate until it clicks in place.
INNER STRUCTURE OF THE BAROMETER
Calibration of the PTB110 series barometers is NIST traceable
and the barometers are supplied with a NIST traceable
calibration certificate.
There are two push buttons available for the offset fine
adjustment inside the barometer (see the figure on the previous
page). The adjustment step is 0.05 hPa.
OPERATING THE BUTTONS
Restoring Adjustments
To restore the adjustments, press and hold down the left button
while switching on the barometer. After releasing the button, a
green LED starts flashing.
When the factory adjustments are in use, the green LED flashes
twice. When the user adjustments are in use, the green LED
flashes three times.
Now you can change the factory adjustments to user adjustments
or vice versa by pressing the left button.
Return to the normal operating mode by switching the power off
and on in sequence.
Using Analog Output Test Mode
To activate the test mode, press and hold down the right button
while switching on the barometer.
The function forces the voltage or frequency output to 50% of
the scale. As an indication of the test mode, the red LED is lit.
Return to the normal operating mode by switching the power off
and on in sequence.
Offset Correction
To activate the offset correction mode, press and hold down both
buttons switching on the barometer.
The green and red LEDs are lit. Now you can adjust the offset
correction upwards or downwards.
Each time when pressing the left button, the offset
goes down by one step (5 Pa), and the green LED
flashes once.
Each time when pressing the right button, the offset
goes up by one step (5 Pa), and the red LED flashes
once.
Return to the normal operating mode by switching the power off
and on in sequence.
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Dimensions
TECHNICAL DATA
Operating range
(1 hPa=1 mbar)
Pressure ranges
Temperature range -40...+60°C
Humidity range Non-condensing
Accuracy Description/Value
Linearity* ±0.25 hPa
Hysteresis* ±0.03 hPa
Repeatability* ±0.03 hPa
Calibration uncertainty** ±0.15 hPa
Accuracy at +20 °C*** ±0.3 hPa
Notes Description / Value
* Defined as ±2 standard deviation limits of end-point
non-linearity, hysteresis error or repeatability error
** Defined as ±2 standard deviation limits of inaccuracy
of the working standard including traceability to NIST
*** Defined as the root sum of the squares (RSS) of end-
point non-linearity, hysteresis error, repeatability error
and calibration uncertainty at room temperature
Total accuracy
+15...+25 °C ±0.3 hPa
0...+40 °C ±0.6 hPa
-20...+45 °C ±1.0 hPa
-40...+60 °C ±1.5 hPa
Long-term stability ±0.1 hPa/year
Description/Value
500...1100 hPa
600...1100 hPa
800...1100 hPa
600...1060 hPa
800...1060 hPa
General
Supply voltage 10...30 VDC
Supply voltage control With TTL level trigger
Supply voltage
sensitivity
Output frequency 500...1100 Hz
Resolution 0.1 hPa
Load resistance 10 kohm minimum
Load capacitance 47 nF maximum
Settling time 1 s to reach full accuracy after power-
Response time 500 ms to reach full accuracy after a
Acceleration sensitivity Negligible
Pressure connector M5 (10-32) internal thread
Pressure fitting Barbed fitting for 1/8"
Minimum pressure limit 0 hPa abs
Maximum pressure limit 2000 hPa abs
Electrical connector A removable connector for five wires
Terminals
Housing material plastic
cover
Metal mounting plate AI
Weight 90 g
Housing classification IP 32
Negligible
Less than 4 mA Current consumption
Less than 1 µA in shutdown mode
0...2.5 VDC Output voltage
0...5 VDC
up
pressure step
(AWG 28...16)
Pin 1: External triggering
Pin 2: Signal ground
Pin 3: Supply ground
Pin 4: Supply voltage
Pin 5: Supply output
ABS/PC blend
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SAFETY PRECAUTIONS
The PTB110 delivered to you has been tested for safety and
approved as shipped from the factory. Note the following
precautions:
WARNING Ground the product, and verify outdoor
installation grounding periodically to
minimize shock hazard.
CAUTION Do not modify the device. Improper
modification can damage the product or lead
to malfunction.
ESD Protection
Electronic Discharge (ESD) can cause immediate or latent
damage to electronic circuits. Vaisala products are adequately
protected against ESD for their intended use. However, it is
possible to damage the product by delivering electrostatic
discharges when touching, removing, or inserting any objects
inside the equipment housing.
To make sure you are not delivering high static voltages
yourself:
• Handle ESD sensitive components on a properly grounded
and protected ESD workbench. When this is not possible,
ground yourself to the equipment chassis before touching
the boards. Ground yourself with a wrist strap and a
resistive connection cord. When neither of the above is
possible, touch a conductive part of the equipment chassis
with your other hand before touching the boards.
• Always hold the boards by the edges and avoid touching the
component contacts.
RECYCLING
Recycle all applicable material.
Dispose of batteries and the unit
according to statutory regulations. Do
not dispose of with regular household
WARRANTY
Vaisala hereby represents and warrants all Products
manufactured by Vaisala and sold hereunder to be free from
defects in workmanship or material during a period of twelve
(12) months from the date of delivery save for products for
which a special warranty is given. If any Product proves
however to be defective in workmanship or material within the
period herein provided Vaisala undertakes to the exclusion of
any other remedy to repair or at its own option replace the
defective Product or part thereof free of charge and otherwise on
the same conditions as for the original Product or part without
extension to original warranty time. Defective parts replaced in
accordance with this clause shall be placed at the disposal of
Vaisala.
Vaisala also warrants the quality of all repair and service works
performed by its employees to products sold by it. In case the
repair or service works should appear inadequate or faulty and
should this cause malfunction or nonfunction of the product to
which the service was performed Vaisala shall at its free option
either repair or have repaired or replace the product in question.
The working hours used by employees of Vaisala for such repair
or replacement shall be free of charge to the client. This service
warranty shall be valid for a period of six (6) months from the
date the service measures were completed.
This warranty is however subject to following conditions:
a) A substantiated written claim as to any alleged defects shall
have been received by Vaisala within thirty (30) days after
the defect or fault became known or occurred, and
refuse.
b) The allegedly defective Product or part shall, should Vaisala
so require, be sent to the works of Vaisala or to such other
place as Vaisala may indicate in writing, freight and
insurance prepaid and properly packed and labelled, unless
Vaisala agrees to inspect and repair the Product or replace it
on site.
This warranty does not however apply when the defect has been
caused through
a) normal wear and tear or accident;
b) misuse or other unsuitable or unauthorized use of the
Product or negligence or error in storing, maintaining or in
handling the Product or any equipment thereof;
c) wrong installation or assembly or failure to service the
Product or otherwise follow Vaisala's service instructions
including any repairs or installation or assembly or service
made by unauthorized personnel not approved by Vaisala or
replacements with parts not manufactured or supplied by
Vaisala;
d) modifications or changes of the Product as well as any
adding to it without Vaisala's prior authorization;
e) other factors depending on the Customer or a third party.
Notwithstanding the aforesaid Vaisala's liability under this
clause shall not apply to any defects arising out of materials,
designs or instructions provided by the Customer.
This warranty is expressly in lieu of and excludes all other
conditions, warranties and liabilities, express or implied, whether
under law, statute or otherwise, including without limitation any
implied warranties of merchantability or fitness for a particular
purpose and all other obligations and liabilities of Vaisala or its
representatives with respect to any defect or deficiency
applicable to or resulting directly or indirectly from the Products
supplied hereunder, which obligations and liabilities are hereby
expressly cancelled and waived. Vaisala's liability shall under no
circumstances exceed the invoice price of any Product for which
a warranty claim is made, nor shall Vaisala in any circumstances
be liable for lost profits or other consequential loss whether
direct or indirect or for special damages.
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