4
3.4
Flow Through Copper Sensor/Sample Loop Installation
The copper flow through sensor is designed for out-of-tank monitoring of electroless
copper and microetch solutions.
The sensor is designed with a glass tube that contains the copper solution that forms
a fixed path length between the lamp and receptor module. The solution absorbs
light at specific wavelengths in proportion to the copper concentration. In order to
avoid a shift in calibration caused by condensation, the sensor cover should NEVER
be removed!
The flow through sensor is provided with a mounting plate and 20 feet of cable.
Extension cable is available if the sensor can not be placed within 20 feet of the
controller. The maximum cable length is 80 feet.
The sample loop consists of a shut off valve, a cooling coil or plate, a sensor and a
pump or any combination thereof. The shut off valve is to quickly isolate the system
if necessary. A cooling coil or plate is necessary to cool the copper solution down to
a temperature acceptable to a sample pump. Cooling the solution is also
recommended to help reduce the amount of plate out which may form in the sample
loop. The pump may be either a stand alone sample pump (which typically have
temperature restriction) or a high temperature pump (which is usually just a branch
off the recirculation pump).
