TESTO 270 - Page 28

7 Maintaining the product
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• The testo 270 should be checked with the Testo
reference oil on a regular basis and adjusted if
necessary (accuracy +/- 2.5% TPM)
4
). We recommend
a monthly check as part of quality assurance.
• We recommend you always use the Testo reference oil
for calibration/adjustment of the sensor (order no.
0554 2650, 1 piece).
• The sensor is exposed to large temperature jumps and
pollutants while in measuring mode. We therefore
recommend having an annual test carried out by Testo
Customer Service. For more information go to:
www.testo.com.
Prepare calibration / adjustment with testo reference oil
1. Clean sensor before the calibration/adjustment, see Cleaning
the sensor, page 26.
When heating the reference oil, make sure that no water
gets into the reference oil or onto the sensor.
The reference oil must be heated to approx. 50 °C for
calibration and adjustment.
2. Heat water in a container (e.g. a cup) to approx. 50 °C. Place
closed reference oil bottle in the water bath for approx. 10 min
(maximum water level to lower edge of sealing cap). Then
briefly shake the closed reference oil bottle, for better heat
distribution in the bottle.
Carry out calibration / adjustment
1. Switch the instrument on, press and hold down [Hold] during
the display test for approx. 2 secs.
- When the PIN is deactivated, Alarm lights up in the
display.
> when the PIN is activated: Enter PIN.
4
typically, based on Testo in-house reference, at an ambient temperature of
25 °C.