SATO KEIRYOKI SK-500B User manual

Instruction Manual
No. 7630-00 Digital Barometer
Model SK-500B
3-4, Kanda-kajicho, Chiyoda-ku, Tokyo 101-0045 Japan
URL: http://www.sksato.co.jp/english/
V. R01E

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Thank you for purchasing the Digital Barometer Model SK-500B.
- This product is designed to measure atmospheric pressure. Do not use it for other purposes.
- Read this manual thoroughly before using. Keep the manual in a safe place for future references
whenever necessary.
Warning
The SK-500B is not explosion-proof. Never use it in an atmosphere containing flammable gases.
Beware of explosion!
There is a risk of explosion. Take extreme care.
Should you have any questions, please consult with us or the store where the unit was purchased.
Caution
■ Observe the following precautions to use this equipment correctly.
・ This is a precision equipment. Do not drop or apply impact or vibrations to it.
・ Be sure to use this equipment in standard air composition (general atmosphere).
・ Do not use this equipment outside the measuring range. Doing so may result in failure.
・ Check the operating condition and use the equipment within the operating condition.
・ Do not use this equipment near heaters. Doing so may result in failure or casing deformation.
・ This equipment is not waterproof and so must not be allowed to get wet.
・ Do not leave this equipment in a car or like since the temperature raises extremely high under the
midsummer heat. Doing so may be a cause of trouble.
・ Never disassemble or modify the equipment. Doing so may result in failure.
・ Do not use this equipment in an area subject to dust, flammable gas, explosive gas, corrosive
gas (SO2, H2S, etc.), etc.
・ Using this equipment in an environment with electrical noise may produce an unstable display or
an increase in measurement errors.
・ Do not wash or wipe the equipment with solvents such as alcohol or thinner. If the equipment
becomes dirty, dip a gauze pad or soft cloth in warm water containing neutral detergent, wring
out the cloth, and then wipe the equipment with the cloth.
*** For repair or calibration, contact us or the store where the unit was purchased.

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Overview
The SK-500B is a desktop type digital barometer using a piezo resistance pressure sensor.
The standard functions include the display of computed maximum and minimum values, RS-232C or
printer output and monitoring with upper and lower limit alarms.
Features
• Wide measuring range of 600 to 1100 hPa
• High resolution of 0.01 hPa
• Red LED for easy visibility
• Display of various arithmetic results
The values of maximum (MAX), minimum (MIN), moving average (AVG) and relative (REL) are
calculated and displayed.
• RS-232C output
Equipped with an RS-232C output. Using the exclusive application, measured values can be
displayed on a computer in real time and also stored with “CSV” format.
* Visit our web site to download the exclusive application.
• Printer output
With the optional dedicated printer, measurement results can be printed out in real time.
• Upper and lower limit alarms
Equipped with a contact output that can be connected to an external alarm device such as a buzzer
and revolving light. Upper and lower limit alarm values can be separately set.
Safety Precautions
Check that the unit has not been damaged during transportation.
If any damage is found, contact us or the store where the unit was purchased.

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Names of Components
Front view
Rear view
① Display : Displays measured values or the status of the unit.
② POWER key : Used to turn on or off the unit.
③ MAX/MIN/▲ key : Used to switch between the MAX or MIN function.
Used to increase the setting values in the setting mode.
④ REL/▼ key : Used to set the REL function to ON or OFF.
Used to decrease the setting values in the setting mode.
⑤ OUT/ENTER key : Used to set the RS-232C/Printer output to ON or OFF.
Used to confirm the setting values in the setting mode.
⑥ MODE key : Used to switch between the setting and measuring modes.
⑦ Pressure port : Inlet for atmospheric pressure
⑧ RS-232C/Printer output port
⑨ Alarm output port
⑩ AC adapter connection port

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How to use
1. Installation
SK-500B is an indoor use desk-top digital barometer. Install the equipment horizontally avoiding the
places as below.
 In flammable gas, explosive gas and corrosive gas
 A place subject to direct sunlight and near heaters
 At the exhaust port of air conditioner
 In a place subject to vibration
 In outside of the operation ambient (-10 to 50°C, less than 85%rh, no condensing)
 In an envelopment with electric noise
 Near splashing water and the place rainwater pours.
2. Connection
2-1. Pressure port
This is the inlet for atmospheric pressure. An R1/4 fitting can be used for connection. When
connecting a fitting, use a sealing material such as sealing tape to prevent leakage.
- Fitting tightening torque: 10 to 12 Nꞏm –
Caution
• Do not allow any foreign matter such as the end of the sealing material to enter inside the pressure
port. If foreign matter gets inside, measurement errors or failure could result.
• When installing the fitting, do not overtighten it as this could result in failure.
Be sure to tighten it within the tightening torque range.
2-2. RS-232C/Printer output
When the RS-232C/Printer output is to be used, first connect the cable below to the RS-
232C/Printer output port on the back of the unit.
When a USB-Serial cable is used for the first time, you may have to install the USB driver.
For details on installing the USB driver and its system requirements, refer to the instruction manual
of the USB-Serial cable that you will use.
Communications standard for RS232C and Printer output
Connection Connection cable / connector
Personal
computer
Serial connecting terminal
(D-sub 9 pin, male)
Attached RS232C cable (D-sub 9 pin, crossing)
USB connecting terminal
(Type-A, female)
Attached RS232C cable (D-sub 9 pin, crossing)
and USB serial cable
Exclusive printer Serial connecting terminal
(D-sub 9 pin, female)
Attached cable for printer (D-sub 9 pin, straight)
Note: We have checked the operation with the USB-Serial cables (Japanese version) listed below.
Depending on the use of other USB-serial cable, the country to be used and the connection
environment, the unit may fail to operate correctly. Our technical and customer supports are
provided to Japanese OS only.
 BSUSRC0605BS (cable length: 0.5 m) of Buffalo Inc. (supplied with the product)
 BSUSRC0610BS (cable length: 1.0 m) of Buffalo Inc.

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 Connection: SK-500B – Personal computer (serial connecting terminal)
 Connection: SK-500B - Personal computer (USB connecting terminal)
 Connection: SK-500B – Printer (serial connecting terminal)
Personal computer: Serial connecting terminal
(D-sub 9 pin, male)
Attached RS-232C cable (crossing)
Connector:
D-sub 9 pin, female
Connector:
D-sub 9 pin, female
Personal computer: USB connecting terminal
(Type-A, female)
Attached RS-232C cable
(crossing)
Attached USB serial cable
Connector:
USB Type A, male
Connector:
D-sub 9 pin, male
Connector:
D-sub 9 pin, female
Connector:
D-sub 9 pin, female
Printer: Serial connecting terminal
(D-sub 9 pin, female)
Attached cable for printer (straight)
Connector:
D-sub 9 pin, male
Connector:
D-sub 9 pin, female

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2-3. Alarm output ports
These ports are used to connect an external alarm device. The unit uses a relay contact for its
alarm output. The devices to be connected must meet the following conditions:
Maximum rating: Load voltage : 280 VAC/VDC Max.
Continuous load current: 100 mA
Be sure to make the correct connection by referring to the figure below.
Note: The screws on both edges of the terminal block are used to hold the terminal block. Do
not remove them.
2-4. AC adapter connection port
This port is used to connect the AC adapter. Insert the AC adapter plug all the way into the
terminal.
NB. When using another adaptor that was not included in the instrument, select an adaptor which
meets following specifications
<Primary output> Voltage : 9VDC
Electrical Current : 600mA or more
Polarity :
Plug diameter : outer diameter ø5.5mm, inner diameter ø2.1mm,
length 9.5mm
High terminal: Connect the device for
the upper limit alarm.
Low terminal: Connect the device for
the lower limit alarm.
alarm device
power

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3. Turning on the unit
After completing the necessary connections to the unit and external devices, press the POWER key
to turn on the unit. The self-diagnosis function checks the system, and then the measuring operation
starts.
The system is checked for
3 seconds (self-diagnosis).
Measuring operation starts.
4. Cautions on Use
For accurate measurement, observe the following.
4-1. Warm-up
Upon power-on, allow about 30 minutes to warm up before starting operation.
4-2. Measurement position
Atmospheric pressure differs according to height.
Align the reference level on the unit with the height of the pressure to be measured.
The reference level on the unit is set to the center of the pressure port.
Reference level

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5. Function and Setting
5-1. Measuring mode: This mode is for measuring atmospheric pressure.
(Upon power-on, the unit enters the measuring mode.)
○ AVG function
This function displays the moving average value per 10 data items.
When the AVG function is set to ON, the AVG light turns on and the following functions are operated
based on the moving average values.
- MAX/MIN function
- REL function
- ALARM function
- RS-232C/Printer output
Note: The AVG function is set to ON at the factory.
To set the averaging function to OFF, refer to "Setting mode" on page 10.
The moving average is based on a fixed 10 data items; the number of data items cannot be
changed. If the number of data items falls below "10", the average value of data items up to
the time is displayed.
○ MAX/MIN function
This function records and displays the maximum (MAX) and minimum (MIN) values recorded since
power-on.
Pressing the MAX/MIN key toggles among maximum, minimum and measured values in this order.
The MAX or MIN light turns on when the MAX or MIN value is displayed, respectively.
To reset the MAX or MIN value, press and hold the MAX/MIN key for at least two seconds while
the maximum or minimum value is being displayed. The MAX and MIN lights, as well as the
measured value, start flashing to indicate that the maximum and minimum values are reset.
Note: The maximum or minimum value is also reset under the following conditions:
- When the unit is turned off
- When the unit enters the setting mode
Note: The function cannot be used in combination with the REL function.
○ REL function
This function displays the relative values (changes in measured values) compared to the current
measured value (set to 0.00 hPa).

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① Press the REL key in the measuring mode.
The REL light turns on to indicate that the measured value is set to "0.00".
② To cancel, press the REL key again.
The REL light goes out to indicate that the unit has returned to the measuring mode.
Note: The REL function is also cancelled under the following conditions:
- When the unit is turned off
- When the unit enters the setting mode
Note: The function cannot be used in combination with the MAX/MIN function.
○ Alarm function
If the measured value exceeds or falls below the alarm value, the ALARM light flashes and notifies
the user via the contact output. Upper and lower limit alarm values can be separately set.
For setting the alarm, refer to "Setting mode" on page 10.
Alarm operation conditions: Upper limit alarm: Measured value ≦ Alarm value
Lower limit alarm: Measured value ≧Alarm value
The alarm operation on the unit has a hysteresis of 1 hPa for protection of alarm devices.
The alarm operation is cleared under the following conditions:
Alarm clearing conditions: Upper limit alarm: Measured value ≦alarm value – 1 hPa
Lower limit alarm: Measured value ≧alarm value + 1 hPa
* Operation example (upper limit alarm is set to 1050 hPa):
The alarm operation is activated when the measured value is 1050.00 hPa or higher.
The alarm is cleared when the measured value is equal to 1049.00 hPa or less.
Note: The alarm operation is retained while the maximum, minimum or relative value is being
displayed.
The alarm is triggered based on the measured value even while the maximum, minimum or
relative value is being displayed.
Note: The alarm operation is cancelled while in the setting mode. The alarm operation resumes
when the unit is returned to the measuring mode.
Measured value
A
larm o
p
eration is activated
A
larm is cleared
1049.00 1050.00 1051.00

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○ RS-232C/Printer output
The measured values can be output to the computer or dedicated printer through the RS-232C
serial output. For setting the RS-232C/Printer output, refer to "Setting mode" on page 10.
Note: When using the dedicated printer, first turn on the unit and then turn on the printer.
If the printer is turned on before the unit, an abnormal value could be printed as the first
output value.
① Enter the measuring mode, and then press the OUT key.
The OUT light turns on and the measured values are output.
② To cancel, press the OUT key again.
The OUT light goes out to indicate that the output has been stopped.
Note: Output is stopped and cancelled if the unit is switched to the setting mode.
To output again, switch to the measuring mode.
5-2. Setting mode: Various settings are made in this mode.
Pressing the MODE key while in the measuring mode enters the setting mode. To return to the
measuring mode, press the MODE key on each screen for the setting items shown in the table
below.
Note: When changed to the setting mode from the measuring mode, each ongoing operation in
the measuring mode is forcibly changed as follows.
 MAX/MIN value : Value is reset.
 REL function : Operation is canceled and the REL value is reset.
 Alarm operation : Operation is stopped.
 RS-232C/Printer output : Output is stopped and the operation is canceled.
The settings listed below are available in the setting mode.
Display Setting item Description
AVG Set the moving averaging to ON or OFF.
Alarm Set the upper and lower limit alarm values.
RS-232C/Printer output Set the RS-232C/Printer output.
Clock Set the date and time.

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[Flow chart for Setting Mode]
The measurement mode
Setting mode
[Key operation in the setting mode]
The keys to be used during setting mode are identified by blue text on the unit.
- Selecting or editing the set value
Use the ▲ or ▼ key to select or change the set values.
Hold down the ▲ or ▼ key to quickly change the value.
- Confirming the setting
Press the ENTER key to confirm the set value.
[Backing up the set values]
Because of the internal backup battery, the items set in the setting mode are retained even
after the power is turned off.
Note: The internal backup battery lasts for about five years.
To replace the battery, contact the store where you purchased the unit or our service
network.
○ AVG (Averaging) setting: Set the AVG function to ON or OFF
Default setting (factory setting): ON
① Use the ▲ or ▼ key to select "Av". The AVG light starts flashing. Press the ENTER key.
② Use the ▲ or ▼ key to set to ON or OFF, and then press the ENTER key to confirm.
Display measured value
MODEKey
▲/▼Key ▲/▼Key ▲/▼Key
ENTERKey
ENTERKey
ENTERKey
ENTERKey
ENTERKey
ENTERKeyENTERKeyENTERKey
ENTERKey
ENTERKey
ENTERKey
ENTERKey
ENTERKey
ENTERKey
ENTERKey
ENTERKey
Set ON or OFF Set ON or OFF for
H
(
upper
)
alarm
Set upper limit alarm value
Set ON or OFF for
L
(
lower
)
alarm
Set lower limit alarm value
Select serial output
RS-232C or printer
Set print interval from
5 sec.,1 min. and 15 min.
Set the year
Set the month
Set the day
Set the hour
Set the minute

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○ Alarm setting: Set the upper and lower limit alarm values separately.
 Default setting (factory default) : OFF
 Alarm setting range : 600 to 1100 hPa
 Alarm setting unit : 1 hPa
Note: The lower limit value must be less than the upper limit value.
① Use the ▲ or ▼ key to select "AL". The ALARM light starts flashing. Press the ENTER key.
② Set the upper limit alarm.
Use the ▲ or ▼ key to set to ON or OFF, and then press the ENTER key to confirm.
If set to ON, use the ▲ or ▼ key to set the alarm value, and then press the ENTER key to confirm.
③ Set the lower limit alarm in the same way as above.
○ RS-232C/Printer output setting: Set the RS-232C/Printer output option.
 Default setting (factory setting) : RS-232C
 Output interval : RS-232C:1 sec
Printing : select from 5 sec, 1 min and 15 min.
① Use the ▲ or ▼ key to select "Sr". The OUT light starts flashing. Press the ENTER key.
② Use the ▲ or ▼ key to select either "232C (RS-232C)" or "PRINT (Printer)", and then press the
ENTER key.
③ When "PRINT (Printer)" is selected, use the ▲ or ▼ key to set the print interval, and the press the
ENTER key to confirm.
Display Interval
5 sec.
1 min.
15 min.

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○ Clock setting: Set the clock on the unit.
Note: The clock on the unit has been set at the factory.
① Press the ▲ or ▼ key to select "t", and then press the ENTER key.
② Setting the year
Use the ▲ or ▼ key to set the year, and then press the ENTER key.
③ Setting the month, day, hour and minute
The month digits are flashing. Use the ▲ or ▼ key to set the month, and then press the ENTER
key.
Then, set the day, hour and minute in this order.
Note: In the SK-500B, the "second" is automatically set to "0" at the moment the "minute" setting
is confirmed (ENTER key is pressed).
6. Communications
The specifications of RS-232C/Printer output are as follows.
6-1. Communications standard
Transmission speed : 9600 bps
Data length : 8 bit
Stop bit : 1 bit
Parity check : none
Flow control : none
6-2. Output format
Display of measured values
• When the AVG function is ON, the value of moving average is output, however ON/OFF
information of the AVG function is not output.
• When the MAX/MIN, REL and ALARM functions are active, measured value is output with the
format above, however the values of MAX/MIN or REL are not output.
When the measured value is Hi, Lo, Er or Er2
2 0 1 5 / 0 1 / 0 1 0 0:01:01 Hi CRLF
2 0 1 5 / 0 1 / 0 1 0 0:01:01 Lo CRLF
2 0 1 5 / 0 1 / 0 1 0 0:01:01 Er CRLF
2 0 1 5 / 0 1/ 0 1 0 0:01:01 Er2 CR LF
month dayhour minute second measured valueyear

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Calibration
For maintain the accurate measurement, we recommend to calibrate the unit on a regular basis.
Contact us on the calibration.
Error message
Code Description Action
Hi Measured value exceeds the upper
limit of the display range
Use within the measuring range
Lo Measured value exceeds the lower
limit of the display range
Er Measured value is abnormal
Er2 Pressure sensor is abnormal
Keep the unit away from equipment generating
electrical noise. When the problem has not
been solved even if a measure against noise is
taken, the unit is likely to be faulty. Stop using
and contact us or the store where you
purchased the unit.
Er0 to 5 Unit is failure Stop using and contact us or the store where
you purchased the unit.
Troubleshooting
Problem Possible cause Action
Readings are unstable. The unit is being used in an
environment where electrical
noise is generated.
Keep the unit away from equipment
generating electrical noise.
If the cause comes from the power line,
use stabilized power source
Ambient temperature is
fluctuating.
Leave the unit in the ambient
temperature for a while to adapt before
using the unit.
Air is blowing against the
pressure port.
Reinstall the unit such that it is not
affected by wind.
Measured values are not
retained.
Backup battery is exhausted. Contact us or the store where you
purchased the unit.
* If the problem still exists after trying the above actions, contact us or the store where you purchased
the unit.

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Specifications
Cat. No. No. 7630-00 Digital Barometer
Model SK-500B
Measuring range 600.00 to 1100.00 hPa
Resolution 0.01 hPa
Accuracy ±0.50 hPa (at 700.00 to 1100.00 hPa, 10 to 40°C)
±1.00 hPa (other than above)
Sampling time approx. 1 sec.
Pressure sensor Piezo resistance pressure sensor
Display 7 segment red LED (6 digits), condition display: red LED
Clock accuracy ±1 min. per month
Operation ambient -10 to 50°C, less than 85%rh (No condensing)
Power requirements 9VDC/660mA (exclusive AC adapter: 100 to 240VAC 50/60Hz 0.66A)
Materials Main body : SPCC
Display section : Acrylic resin
Pressure port : SUS304
Dimensions approx. 200(w) x 90(H) x 280(D) mm (without protrusion)
Weight approx. 3.0 kg
Standard accessories Instruction manual
AC adapter x 1
RS-232C cable x 1
USB serial cable (with CD-ROM for USB driver) x 1
* The specifications or appearance subject to change for improvement with or without notice
Exclusive Printer (Option)
Cat. No. No. 7630-00 Printer for SK-500B Digital barometer
Operation ambient 0 to 40°C, 30 to 80%rh (No condensing)
Power requirements Exclusive AC adapter and built-in chargeable battery
Dimensions approx. 170(w) x 66.5(H) x 160(D) mm
Weight approx. 690g
Standard accessories Instruction manual (CD-ROM) x 1
Exclusive AC adapter x 1
Printing paper x 1
Printer cable x 1
* The specifications or appearance subject to change for improvement with or without notice
Consumable
No. 8009-82 Printing paper (10 rolls/pack) for No. 7630-00 printer
Warranty conditions comply with our Warranty Policy