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WNI Series Electroless Nickel Controllers


Product Description

Walchem’s WNI Series Nickel Controllers are optoelectronic on-line analyzers that measure the actual concentration of nickel in solution, displayed in grams per liter or ounces per gallon.

Use of these controllers in electroless plating baths reduces the need for manual titration, improves yield and automatically alerts the operator when maximum metal turnover limits have been reached which reduces scrap caused by over extending bath life. Exact set points are known precisely, eliminating the need for repeated adjustments or calibration.

The WNI Series models are low cost, microprocessor-based, menu driven industrial controllers. They are available as nickel-Request Quoteonly, or with a pH controloption which may beadded inthefield. Two separate pump outputs for nickel and reducer and another for pH are used, each of which is capable of totalizing either pump on time, volume pumped or metal turnovers.

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” for nickel only models.

Optional pH Input Board.
May be used to add pH adjustment chemistry. 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.

No Degassing Necessary.
Analog signal conditioning and a proprietary software algorithm eliminate the need for traditional degassing elements.




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

Control Relays 1-4 and Diagnostic Alarm(internally powered)
@ 115VAC, 10A resistive, 1/8 HP
@ 230 VAC, 6A resistive, 1/8 HP

Signals (Optional) Interlock – isolated, dry contact closure required (flow, level).(Optional) pH – accepts preamplified pH signal and a Pt100 or Pt1000 RTD for temperature compensation 4-20mA
Fully isolated, internally powered 600~ max. resistive load.Resolution 0.001% of span, accuracy ± 1% of reading

Measurement Performance

Nickel Concentration pH Temperature
Range .01 to 10 g/L
.001 to 1.33
0 to 14 pH 0 to 100° C
32° to 212° F
Resolution .001 g/L
.0001 oz/gal
.001 pH .05°
Accuracy .01 g/L
.001 oz/gal
±0.01 pH ±.01°


Enclosure Thermoplastic  Ambient temp. 32-158°F (0-70°C)
NEMA rating NEMA 4X (IP65) Storage temp. -20 -180°F (-29 – 80°C)
Dimensions See below Solution temp. 212°F (100°C) maximum
Display 2 x 16 character backlit liquid crystal Shipping wgt. 10 lbs (approximately)
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.