Sensor Installation - Hach ORBISPHERE3650 Manuel D'utilisation De Base

Installation
Figure 1 3650 Portable analyzer
1 Barometric pressure sensor relief valve
2 RS232 port or external power supply
3 Battery cap
The ORBISPHERE 3650 instrument is a self-contained portable analyzer, configured to make
oxygen concentration measurements in gaseous or liquid samples, with Electrochemical (EC)
Sensors.
The instrument is a portable unit and should be located convenient to the sample being analyzed.

Sensor installation

The sensor has a threaded collar and calibration cap, and a screw-on protection cap to prevent
disturbances to the membrane. A plastic screw-on base at its rear provides a stand for servicing, and
protects the sensor's screw-on 10-pin LEMO connection.
The sensor connects to the instrument base through a 10-pin LEMO connector. A locking nut holds
the sensor in place. Generally, the sensor is shipped already installed in the instrument.
Shipping conditions can have adverse effects on the sensor, thus you should perform a sensor
service as described in the accompanying Sensor Manual before trying to make measurements.
Flow chamber installation
The model 32007F flow chamber draws the liquid or gaseous sample past the sensor. It attaches to
the sensor with a threaded collar and is then sealed to the sensor with two O-rings.
The flow chamber centrally located inlet and eccentrically located outlet use either ¼-inch or 6-mm
diameter transparent plastic tubing. Connect by compression fittings to the sample source and to the
drain, respectively.
Regulate the sample flow using the adjustment knob on top of the flow chamber. When switching
from liquid to gaseous samples, ensure that the sensor membrane is dry. Ensure that the gas from
the exit tube of the flow chamber (in gaseous mode) is released at atmospheric pressure and that it
is constant.
4 Flow chamber
5 EC sensor
English 5