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If the E04 error occurs, be sure the load is within the maximum specification and properly balanced (centered
on tray) and/or reduce sample size/speed before restarting the unit. If the E04 error occurs due to
acceptable sample vibration or another vibration source, the vibration sensing function can be disabled as
described above.
2.2.1 Beeper Preference (Muting Audible Alarm)
To silence beeper operation (except for error codes), with the unit in standby mode, press and hold the time
on/off button and press the standby button. Release the standby button first, and then release the on/off
button. To restore normal beeper operation, remove AC power to unit for ten (10) seconds and then restore.
2.2.2 Temperature Calibration Procedure (Single Point)
This procedure is used to fine tune and calibrate the Incubating Orbital Shaker at a specific temperature
setting. This process may be repeated for up to three (3) separate set-points. If a fourth calibration set-point
is entered, the first set-point entered will be overwritten.
1
Turn unit on.
2
Set desired temperature.
3
Stabilize one (1) hour or more, measuring the temperature with a temperature probe/thermometer
centrally located in the chamber.
4
Press and hold standby button, then press the temperature up arrow once. The unit will beep two (2)
times, confirming calibration mode. The display will now be flashing.
5
Press the temperature up/down arrows until the display on the unit matches the external temperature
probe/thermometer. (Example: Desired temperature is 37ºC. Set unit at 37ºC per step 2. Follow steps 3
& 4. Display reads 37ºC and the external temperature probe/thermometer reads higher at 39ºC. Push
the temperature up arrow so the display will match the external temperature device and also read 39ºC.
By doing this a biased offset for 37ºC will be used when unit is set to 37ºC.)
6
Press standby button to exit calibration mode and return to normal heating.
This process may be repeated at the same set-point, multiple times for fine tuning if desired.
The unit will now use the biased offset for that specific temperature setting and increase or decrease
temperature accordingly to bring the chamber temperature to set-point. The decimal point of the display
will flash to indicate a biased offset is being used. All other temperature settings will use the standard
internal calibration. This offset will be stored in memory and retained until reset.
2.2.3 To restore unit to factory setting
Press and hold the standby button while pressing the temperature down arrow once. The reset will be
confirmed with two (2) audible beeps. Press the standby button to exit calibration mode and return to normal
heating.
2.2.4 Speed Calibration Procedure
This procedure is used to self calibrate the symphony™ Orbital Shakers. The tray should be free of any
samples, vessels, and accessories prior to calibrating.
1
Turn unit on. Speed and time displays will be illuminated.
2
Press and hold the standby button and momentarily press the speed on/off button. The speed display
should read. "CAL".
3
The unit will run for approximately one (1) minute and automatically calibrate.
2.2.5 RS-232 Serial Port
The RS-232 serial port provides two-way communications for data logging and unit control. If you need
additional details, please contact your Ohaus representative for support.
NOTE: To comply with EMI/EMC requirements, the length of the external cable shall not exceed 3 meters.
2.3 ISHD23CDG Upper Ambient Control Limit
Please follow the procedure below if setting the ISHD23CDG unit's temperature at/near the room's ambient
temperature. For optimum temperature control in the chamber of the ISHD23CDG unit, the upper ambient
control limit is to be set a minimum of 3ºC above the measured room temperature.
Example: Measured (ambient) temperature is 22ºC; the upper ambient control limit should be set at a
minimum of 25ºC.
Incubating Shaker
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