DIGISYSTEM DSO-D Series User manual

DIGISYSTEM LABORATORY INSTRUMENTS INC. www.digisystemlab.com REV.1-2017
Air vent
Controller
INSTRUCTION MANUAL FOR HOT AIR OVEN DSO-D & DSO-DF SERIES
Warnings:
* Make sure that the door is closed well to prevent heat loss and power drain.
* The surface is hot. Do not touch.
* Do not put any objects on the top of the instrument.
* Please keep the environment ventilated.
1. Connect with power supply. Please make sure the power voltage is the same as the voltage shown on the
label stuck on the back of machine.
2. Put your sample in and close the door.
3. Press “ON/OFF Button”, then you will see the “Power indicator’ becomes green. Wait for about 5 seconds;
you can see that on the display screen, the top row is the present temperature value (PV) and the bottom
row is the setting temperature value (SV).
4. Set temperature: you will see . Press or to adjust SV value and then press to
enter the value.
5. Set time: Select time mode: Continouos mode or Timer mode .
5.1 Press to set Continuous mode. OUT2 indicator on display screen will disappear. The
setting is finished. Go to Step 6.
5.2 Press to set Timer mode. OUT2 indicator on screen will appear.
5.2.1 You will see or .
5.2.2 Use or key to select time unit (hour) or (minute). Press
to enter the value. Press to next setting.

DIGISYSTEM LABORATORY INSTRUMENTS INC. www.digisystemlab.com REV.1-2017
5.2.3 You will see . Use or key to adjust the time value. Press to enter the
value. Press to next setting.
5.2.4 You will see . Press and you will see . The setting is
finished.
Remark: If you want to interrupt the timer mode, you can press to be continuous mode.
6. After finishing the work, please press “ON/OFF Button” to turn off the power, and then the “Power
indicator’ becomes red.
Remark:
1. When the “OUT1” indicator on the display screen is sparkling, it means that the instrument is heating.
2. After the PV value reaches to SV value and tends to be stable, the “ALM1” indicator lamp will appear if the
PV value exceeds the SV value by setting point (10℃). In this situation, please turn the power off, open
the door and wait for about 30 minutes, and then restart it.
3. If you feel the PV value is much higher or lower than the SV value, you can adjust the “Air vent” on the
back of machine to balance the temperature. That is, if the PV value is too high, you can open the “Air
vent”; if the PV value is too low, you can close the “Air vent”.
Maintenance and care:
Keep the machine clean all the time, so no routine maintenance is required. Cleaning can be done with a
damp cloth. Avoid the use of solvents as they may damage the product housing and inner chamber.
Circuit Diagram:

DIGISYSTEM LABORATORY INSTRUMENTS INC. www.digisystemlab.com REV.1-2017
Other functions:
Note: Before executing other functions , please make sure that the continuous mode is selected.
If you see OUT2 indicator on the screen, please press to set Continouos mode.
1. Other functions include PV shift (offset) value, setting alarm point, setting temperature unit, auto
tuning function.
Action
Display
(Initial value)
Explanation
Adjustment
Press
(0)
PV shift (offset) value. If PV value is not
correct, you can use this function to calibrate
by your own thermometer.
Press or to adjust
the value. Then press
to enter the value.
If you want to go back to
PV/SV display, press
again.
Press
(10)
Upper-limit point for alarm. When the
difference between PV and SV is over
upper-limit, the alarm indicator (ALM1) on
display screen will be flashing.
Press
(10)
Lower-limit point for alarm. When the
difference between SV and PV is over
upper-limit, the alarm indicator (ALM1) on
display screen will be flashing.
Press
(C)
Temperature unit. C or F.
Press
(OFF)
Auto-tuning function. When auto-tuning
function is on, the “AT” indicator” on display
screen is flashing. When the function is off, the
light of the “AT” indicator” is extinguish.
2. Restore default value:
2.1 Press more than 3 seconds, and then you will see 。
2.2 Press and then press , you will see is flashing. Please press to enter the value.
Then the default value is restored.
Service Manual
Troubleshooting Guide
Caution: Always disconnect the power cord before troubleshooting.
Trouble
Cause
Remedy
Instrument inoperative
Power cord not connected to outlet.
Plug instrument in.
Dead power output.
Change to different output.
No fuse Breaker is off
Press the breaker back of the machine, and
check if the current is overload.
Electronic element broken
Contact your distributor for repair.
Power switch is broken
Contact your distributor for repair.
Controller can’t control the
temperature
Sensor is broken
Contact your distributor for repair.
Controller
Contact your distributor for repair.
Heater is broken
Contact your distributor for repair.
The key of PID controller can’t
work
The keys has been locked
Please refer to the other function to release
the lock status.
Temperature is not stable
The initial setting value is not suitable for the
ambient air temperature where the machine is
located
Refer to theother functions, execute the
Auto-tuning function.
PV value is not correct
User’s calibration thermometer is different
from the factory’s calibration thermometer
Refer to theother functions, execute the
function for PV shift (offset) value.