SHB_U14 Chapter 3: Module components 3-29
Thermostat circuit board
Location in module
The circuit board is attached to the main frame.
Structure
The circuit board contains two heat resistors.
The temperature probe (NTC) is soldered to a cable.
There can be a soldered cable connection to a supplemental heater.
Power supply and control signals enter via a plug connection.
The thermal link is fitted in a clamp connection.
Function
The thermostat circuit board is used to control the temperature of the optical
components, especially the sample cells.
This provides the following advantages:
• Minimized temperature dependency
• Small measurement ranges
• Reduced signal drift that can be caused by other external effects.
The thermostat control option is activated by software settings.
The temperature control is set to 55°C.
The thermal link trips at 85°C.
Figure 3-28
1 Plug X1, power supply and control
2 Connection to supplemental heater in hood
3 Temperature probe (NTC)
4 Heat resistors
Figure 3-29
Thermostat circuit
board pin layout
Inputs/Outputs
X1 Plug connection to Sensor-CPU
X2 Thermal link clamp
R5 Solder points for NTC temperature probe
XA1/XA2 Plug connection for supplemental heater in hood
To Next Page
Loading...
