Sample Temperature - ABB 7835 User Manual

7835
Hydrazine Monitor

5.3.3 Sample Temperature

The temperature of the sample water is monitored continuously
using a Pt1000 resistance thermometer housed in the sensor
flowcell. Hydrazine measurement is compensated automatically
for variations in sample temperature and flow within the set
range – see Table 5.1, page 14.
If the temperature of the sample rises above 55 °C (131 °F), the
display reads 'hot' and the current outputs remains at the last
known values; returning to normal measurement when the
temperature falls below 55 °C (131 °F).
Outlet Valve
Microporous
Disc
Sensor
Fig. 5.1 Sample System During Normal Operation – Flow Diagram
Outlet Valve
Microporous
Disc
Sensor
Fig. 5.2 Sample System During Calibration Phase – Flow Diagram
IM/7835–EN Rev. P
Reagent Container
Filler Cap Outlet Valve
Boyle-Mariotte
Tubes
Reagent
Dosing
Chamber
Reagent Container
Filler Cap Outlet Valve
Boyle-Mariotte
Tubes
Reagent
Dosing
Chamber
If the sample temperature falls below 5 °C (41 °F), hydrazine
concentration is still displayed but a fixed automatic temperature
compensation appropriate to 5 °C (41 °F) is applied.
The temperature is required to determine the necessary sample
flow from Table 5.1, page 14 when setting-up the monitor.
Standard Solution
Container
Filler Cap
To Drain
Solenoid Valve
Standard Solution
Container
Filler Cap
Solenoid Valve
Constant Head Unit
Sample Inlet
Constant Head Unit
To Drain
Sample Inlet
5 Commissioning
Adjustable
Overflow
Tube
Adjustable
Overflow
Tube
15