Instrument Overview - Hach ORBISPHERE 3658 Manuel D'utilisation Simplifié

residential area is likely to cause harmful interference, in which case the user will be required to
correct the interference at their expense. The following techniques can be used to reduce
interference problems:
1. Disconnect the equipment from its power source to verify that it is or is not the source of the
interference.
2. If the equipment is connected to the same outlet as the device experiencing interference, connect
the equipment to a different outlet.
3. Move the equipment away from the device receiving the interference.
4. Reposition the receiving antenna for the device receiving the interference.
5. Try combinations of the above.
Section 3 Installation

3.1 Instrument overview

Figure 1 ORBISPHERE 3658 portable CO
1 Sample flow inlet
2 Flow rate adjustment valve
3 Flow chamber
4 Sample flow outlet
5 Pressure relief valve
6 RS-232 port and DC power connection
The ORBISPHERE 3658 portable analyzer accurately measures carbon dioxide in dissolved phase,
using a thermal conductivity sensor. The analyzer can store up to 500 measurements, and its
rechargeable batteries allow up to 15 hours continuous operation.
Before each measurement the TC sensor is automatically flushed with ambient dried air supplied by
the integrated pump and condenser, and sucked into the flow chamber through the purge gas inlet
(No. 8 in Figure 1) before being released back into the atmosphere via the purge gas outlet (No.
11 in Figure 1).
After each purge, the gas to be measured diffuses from the liquid sample through the membrane,
changing the thermal conductivity of the gas surrounding the detector. As each gas has its own
specific thermal conductivity the measurement is not affected by the presence of other gases unlike
6 English
analyzer - front and rear view
2
7 Battery cap
8 Purge gas (air) inlet
9 Flow chamber locking nut
10 TC sensor
11 Purge gas (air) outlet
12 Sensor locking pin