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WCU Series Electroless Copper Controllers


Product Description

Walchem’s WCU Series Copper Controllers are optoelectronic on-line analyzers that measure the actual concentration of copper in solution. They are used in a variety of applications including electroless copper plating baths and microetch baths (including oxide-replacement types).

Use of these controllers reduces the need for manual titration, improves yield and in microtech applications, improves productivity by reducing the frequency of bath change-outs.

The WCU Series models are low cost, Request Quotemicroprocessor-based, menu driven industrial controllers. They may be switched from electrolesscopper mode to microetch mode via a menu choice, eliminating the need for a second controller. Up tofour relays may be used as control outputs that are activated simultaneously. The outputs each have totalizers associated with them to track volume of chemistry pumped or pump on time.

Software, electronics and sensor are constantly monitored without having to take the controller off line. Any error messages are displayed.
Concentration Read In Units.
Selectable between grams per liter (g/L) or ounces per gallon (oz/gal). Backlit digital display also acts as a bar graph for a continuous “visual summary” of measurement versus set point.

Four Separate Control Relays & Outputs.
May be used to add copper, caustic, formaldehyde or chelator/stabilizer chemistries. Each output has a replenishment totalizer which may be set in units of time or volume.

Operator Adjustable.
Concentration set point, alarm set points (high and low), dead band and pump on time are all easily adjustable. An interlock feature allows external devices (such as a flow switch ) to interlock control relays.

Programmable Access Codes.
Secure set point parameters. Program any four digit access number or disable the code requirement entirely.




Power Power 115VAC ±15%
50/60 Hz, 50mA
230VAC ±15%
50/60 HZ, 30mA


Fully isolated, internally powered 600~ max. resistive load.
Signals (Optional) Interlock – isolated, dry contact closure required (flow, level). Resolution 0.001% of span, accuracy ± 1% of reading

Measurement Performance


Range .01 to 5.5 g/L (.001 to 0.73 oz/gal)
(Electroless Copper)
Range .01 to 99 g/L (.001 to 13.2 oz/gal)
(Microtech Copper)
Resolution .001 g/L (.0001 oz/gal)
Accuracy .01 g/L (.001 oz/gal)


Enclosure Thermoplastic Storage temp. -20 -180°F (-29 – 80°C)
NEMA rating NEMA 4X (IP65) Solution temp. 200°F (93°C) maximum
Display 2 x 16 character backlit liquid crystal Shipping wgt. 10 lbs (approximately)
 Ambient temp. 32-158°F (0-70°C) Sensor cable  80 ft. maximum – 20 ft. standard


Agency Certifications

UL: UL61010-1, 2nd Edition
CSA: C22,2 No.61010-1 2nd Edition
CE Safety: EN 61010-1 2nd Edition
CE EMC: EN 61326 :1998 Annex A*
Note: For EN61000-4-6, 3 the controller met performance criteria B.

*Class A equipment: Equipment suitable for use in establishments other than domestic, and those directly connected to a low voltage (100-240 VAC) power supply network which supplies buildings
used for domestic purposes.