7 Maintaining the product
43
7.3. Charging the battery
The rechargeable battery can only be charged at an ambient
temperature of ±0 to +35°C. If the rechargeable battery has been
completely discharged, the charging time at room temperature with
the testo mains unit is approx. 6 h.
Charging in the measuring instrument
1. Connect the mains unit instrument plug to the instrument's
micro USB socket.
2. Connect the mains plug of the mains unit to a mains socket.
- The charging process will start. The charging process will stop
automatically when the battery is fully charged.
Battery care
> Do not fully exhaust rechargeable batteries.
> Store rechargeable batteries only in charged condition and at
low temperatures, but not below 0°C (best storage conditions
with a charge level of 50-80%, at an ambient temperature of
10 - 20°C, recharge completely before use).
7.4. Replacing sensors
✓ The measuring instrument must be switched off.
1. Place the measuring instrument on its front.
2. Unscrew, lift up and remove the service cover.
3. Disconnect the hose connections from the faulty sensor/bridge.
4. Remove the faulty sensor/bridge from the slot.
5. Install new sensor / new bridge in the slot.
6. Push the hose connections on to the sensor/bridge.
7. Refit and close the service cover.
After replacing an O2 sensor, wait for an equalisation
period of 60 min to elapse before using the instrument
again.
When retrofitting a sensor, the associated measurement
parameter and unit must be enabled, see Sensor settings,
page 31.
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