1.2 Construction and function
A sensor cap is screwed onto the optical window of the sensor type DO 3 integrated in the sensor
shaft. The sensor cap contains fluorescence dye immobilised on a carrier. A black protective cap is
attached to the sensor cap. The sensor has a 10-metre long fixed cable. The sensor can be
immersed under water. The sensor shaft has an Rp1” thread on the cable side. The adapter
included in the scope of delivery is screwed onto the thread to enable the sensor to be connected to
an immersion tube at an angle of 45°. The middle part of the sensor shaft has a groove for a clamp
disc. The clamp ring threaded connection is used to fix the sensor into a suitable ProMinent bypass
fitting. The sensor shaft contains a temperature sensor (Pt 1000). The temperature sensor is used
for internal temperature correction of the measuring signal. The temperature sensor is connected to
the measuring equipment. The sensor is factory calibrated. The temperature-corrected, calibrated
and galvanically isolated 4 ... 20 mA measuring signal leaves the sensor along 2 lines. The supply
voltage is also fed along the same lines (two-line technology).
A2646
4
3
2
1
5
Fig. 1: Construction of the sensor
1
Fixed cable, 10 metres
2
Rp1” thread
3
Sensor shaft with groove for the clamp disc
4
Sensor head area with protective cap
5
Clamp disc
Function
6
