Lauda-Brinkmann | WK class

Circulation chillers with closed cooler circuit for continuous nonstop work in research, technology and production at temperatures from -30 up to 40 °C.

LAUDA WK class circulation chillers are used where operating heat has to be discharged reliably and quickly in chemical production processes or from technical systems – in harsh constant use environments. Unlike cooling with tap water, they provide a constant temperature irrespective of the time of year and pressure fluctuations. The water saving also protects the environment and significantly reduces operating costs.

Application examples

Analytical devices such as electron microscopes, X-ray units, refractometers, distilling systems or AAS units
Rotary evaporators and Soxhlet systems
X-ray control systems e.g. at airports and semiconductor systems
Control of cooling traps e.g. in the drying of gases
Central cooling water supplies for complete laboratories to replace cooling with tap water

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of our WK class brochure:

LAUDA WK class Brochure (1 MB)

	The WK class advantages	Your benefits
	37 different models Cooling capacity from 230 W to 13 kW Independent cooling-water system instead of central cooling-water supply	The right solution for all requirements Cooling-water temperature and pressure always constant Avoids the leakage of substances that are hazardous to the environment
	LED display and 3-button operation	Easy operation
	Easily visible level display and discharge pressure display from WK 1200 All devices with submersible pump	Important operating parameters visible at a glance No seal problems at the pump shaft
	Below the bench height of 79 cm on units up to WK 2400 Small footprint	Fits under the standard laboratory bench top Saves valuable laboratory space

WK class WK circulation chillers up to 600 W

The circulation chillers of the WK class are available with different cooling and pump configurations. The temperature range for all the units is from 0 up to 40 °C.

The LAUDA WK 300 was especially designed for simple cooling tasks down to 0 °C and is ideally suited for the use on the laboratory bench due to its compact size. The circulation chillers WK 500 and WK 502 differ in their cooling and pump output. The WK 502 was especially designed for the connection to atomic absorption spectrometers (ASS). Unlike the WK 500, it has an appropriately upgraded cooling unit and pump.

WK class WK circulation chillers up to 2.8 kW

The differences between the individual units are the effective cooling and pump outputs and the dimensions. All units can be supplied with water cooling (W). This enables greater cooling performance without heating of the surrounding laboratory environment.

WK class WK circulation chillers up to 13 kW

The different cooling capacities are critical when selecting a unit. The WK class circulation chillers from 1 kW cooling capacity upwards are also available with water-cooling (W). In the more powerful WK 7000 to WK 10000 W circulation chillers, a second pump provides the internal circulation in addition to the pump for the external circuit. Thus the cooling capacity and temperature stability do not depend on the flow characteristics in the external circuit. These units can be supplied on request with water cooling (W). For these units, the use of water/glycol mixtures as heat transfer liquid is compulsory.

The LAUDA WK circulation chillers are available with different options, e.g. RS 232/485 interface and enhanced pumping systems.

WK class WKL circulation chillers up to 1 kW

The WKL 230 circulation chiller was especially designed for simple thermostating tasks below 0 °C. Thanks to its extremely compact construction and small footprint it fits anywhere. The temperature range of the WKL 230 is from -10 °C up to 40 °C with a temperature stability of ±0.5 K. The compact circulation chillers WKL 600 to WKL 1000 have different pumps and cooling performance.

WK class WKL circulation chillers up to 13 kW

The WKL circulation chillers differ in terms of their cooling capacities and achieve temperatures of -10 °C (WKL 1200 to WKL 4600 W) or -30 °C (WKL 7000 to WKL 10000 W). All units are also available in the watercooled design (W). With these units, the use of water/glycol mixtures as the heat transfer liquid is compulsory.

Select up to 3 products to compare: Compare Products

WK class WK circulation chillers up to 600 W

Technical features		WK 300	WK 500	WK 502
Select to compare:
Working temperature range*	°C	0...40	0...40	0...40
Temperature stability	±K	0.5	0.5	0.5
Cooling output at 20 °C	kW	0.31	0.50	0.60
Pump pressure max.	bar	0.15	1.0	2.2
Pump flow max.	L/min	8	30	33
Cat. No 100 V; 50 Hz/115 V; 60 Hz		LWM 717	LWG 732	–
Cat. No 230 V; 60 Hz		–	LWG 232	LWG 240
		Summary	Summary	Summary

* Working temperature range is equal to ACC range

WK class WK circulation chillers up to 2.8 kW

Technical features		WK 1200	WK 1200 W	WK 1400	WK 1400 W
Select to compare:
Working temperature range*	°C	0...40	0...40	0...40	0...40
Temperature stability	±K	0.5	0.5	0.5	0.5
Cooling output at 20 °C	kW	1.2	1.5	1.4	1.7
Pump pressure max.	bar	3.2	3.2	1	1
Pump flow max.	L/min	40	40	30	30
Cat. No. 100 V; 50 Hz/115 V; 60 Hz		LWG 733	LWG 761	LWG 737	LWG 762
		Summary	Summary	Summary	Summary

Technical features		WK 2200	WK 2200 W	WK 2400	WK 2400 W
Select to compare:
Working temperature range*	°C	0...40	0...40	0...40	0...40
Temperature stability	±K	1	1	1	1
Cooling output at 20 °C	kW	2.2	2.6	2.4	2.8
Pump pressure max.	bar	3.2	3.2	1	1
Pump flow max.	L/min	40	40	30	30
Cat. No. 100 V; 50 Hz/115 V; 60 Hz		LWG 734	LWG 763	LWG 738	LWG 764
		Summary	Summary	Summary	Summary

* Working temperature range is equal to ACC range

WK class WK circulation chillers up to 13 kW

Technical features		WK 3200	WK 3200 W	WK 4600	WK 4600 W
Select to compare:
Working temperature range*	°C	0...40	0...40	0...40	0...40
Temperature stability	±K	1	1	0.5	0.5
Cooling output at 20 °C	kW	3.5	4.0	4.6	5.3
Pump pressure max.	bar	3.2	3.2	3.2	3.2
Pump flow max.	L/min	40	40	40	40
Cat. No. 208-230 V; 3/PE; 60 Hz	–	LWG 765**	LWG 336	LWG 758
Cat. No. 440-480 V; 3/PE; 60 Hz		–	–	LWG 636	–
Cat. No. 230 V; 3/PE; 60 Hz		LWG 135	LWG 165	–	LWG 158
		Summary	Summary	Summary	Summary

Technical features		WK 7000	WK 7000 W	WK 10000	WK 10000 W
Select to compare:
Working temperature range*	°C	0...40	0...40	0...40	0...40
Temperature stability	±K	0.5	0.5	0.5	0.5
Cooling output at 20 °C	kW	7.0	8.5	10.0	13.0
Pump pressure max.	bar	3.2	3.2	3.2	3.2
Pump flow max.	L/min	40	40	40	40
Cat. No. 208 V; 3/PE; 60 Hz		LWG 345	LWG 347	–	–
Cat. No. 440-480 V; 3/PE; 60 Hz		LWG 645	LWG 647	LWG 649	LWG 651
		Summary	Summary	Summary	Summary

* Working temperature range is equal to ACC range
** 208 V; 3/PE; 60 Hz

WK class WKL circulation chillers up to 1 kW

Technical features		WKL 230	WKL 600	WKL 603
Select to compare:
Working temperature range*	°C	-10...40	-25...40	-20...40
Temperature stability	±K	0.5	1.0	1.0
Cooling output at 20 °C	kW	0.23	0.65	0.52
Pump pressure max.	bar	0.15	1.0	3.2
Pump flow max.	L/min	8	30	33
Cat. No. 100 V; 50 Hz/115 V; 60 Hz		LWM 716	LWG 741	LWG 742
		Summary	Summary	Summary

Technical features		WKL 900	WKL 903	WKL 1000
Select to compare:
Working temperature range*	°C	-20...40	-15...40	-10...40
Temperature stability	±K	1.0	1.0	0.5
Cooling output at 20 °C	kW	0.95	0.8	1.0
Pump pressure max.	bar	1.0	3.2	1.0
Pump flow max.	L/min	30	33	30
Cat. No. 100 V; 50 Hz/115 V; 60 Hz		LWG 759	LWG 760	LWG 473 (115 V; 60 Hz)
Cat. No. 208-230 V; 60 Hz		LWG 859	LWG 860	–
		Summary	Summary	Summary

* Working temperature range is equal to ACC range

WK class WKL circulation chillers up to 13 kW

Technical features		WKL 1200	WKL 1200 W	WKL 2200	WKL 2200 W	WKL 3200	WKL 3200 W
Select to compare:
Working temperature range*	°C	-10...40	-10...40	-10...40	-10...40	-10...40	-10...40
Temperature stability	±K	0.5	0.5	1.0	1.0	1.0	1.0
Cooling output at 20 °C	kW	1.2	1.6	2.2	2.7	3.5	4.2
Pump pressure max.	bar	3.2	3.2	3.2	3.2	3.2	3.2
Pump flow max.	L/min	40	40	40	40	40	40
Cat. No. 208-230 V; 60 Hz		LWG 853	LWG 866	LWG 854	LWG 867	–	–
Cat. No. 208-230 V; 3/PE; 60 Hz		–	–	–	–	LWG 755	LWG 768
		Summary	Summary	Summary	Summary	Summary	Summary

Technical features		WKL 4600	WKL 4600 W	WKL 7000	WKL 7000 W	WKL 10000	WKL 10000 W
Select to compare:
Working temperature range*	°C	-10...40	-10...40	-30...40	-30...40	-30...40	-30...40
Temperature stability	±K	0.5	0.5	0.5	0.5	0.5	0.5
Cooling output at 20 °C	kW	4.6	5.3	7.0	8.5	10.0	13.0
Pump pressure max.	bar	3.2	3.2	6.0	6.0	6.0	6.0
Pump flow max.	L/min	40	40	60	60	60	60
Cat. No. 208 V; 3/PE; 60 Hz		LWG 756**	LWG 757**	LWG 346	LWG 348	–	–
Cat. No. 440-480 V; 3/PE; 60 Hz		–	–	LWG 646	LWG 648	LWG 650	LWG 652
		Summary	Summary	Summary	Summary	Summary	Summary

* Working temperature range is equal to ACC range
** 208-230 V; 3/PE; 60 Hz

Reinforced polymer tubing
Special polymer tubing (EPDM) for high pressures

Cat.-No.:	Description	Temp.-range °C	Max. pressure in bar
RKJ 031	Polymer tube 1/2“ fiber-reinforced	-40...100	20
RKJ 032	Polymer tube 3/4“ fiber-reinforced	-40...100	20
RKJ 033	Polymer tube 1“ fiber-reinforced	-40...100	20

Manifold connectors
For joining multiple external systems (for water/glycol, not suitable for silicone oil)

Cat.-No.:	Description	Connection	Male thread	Temp.-range °C
LWZ 010	Four-port manifold	G 3/4“	4 x 3/4“	-10...100
LWZ 022	Four-port manifold	G 3/4“	4 x 1/2“	-10...100
LWZ 039	Four-port manifold	G 3/4“	4 x 10 mm	-10...100
LWZ 024	Four-port manifold	G 1 1/4“	4 x 3/4“	-10...100
LWZ 038	Four-port manifold	M 16 x 1	4 x 10 mm	-10...100
LWZ 009	Four-port manifold	M 16 x 2	4 x 1/2“	-10...100

Options ex works: WK circulation chillers up to 0 °C

	Cat.-No.:	WK 300	WK 500	WK 502	WK 1200	WK 1200 W*	WK 1400	WK 1400 W*	WK 2200	WK 2200 W*	WK 2400
RS 232/485 digital interface	LWZ 033	-
Flow control instrument	LWZ 034	-			-	-	-	-	-	-	-
	LWZ 035	-	-	-
High-power pump 5.5 bar, 40 L/min. 60-Hz version	LWZ 031-2	-	-	-			-	-			-
High-power pump 5.5 bar, 40 L/min. 60-Hz version	LWZ 032-2	-	-	-	-	-	-	-	-	-	-

	Cat.-No.:	WK 2400 W*	WK 3200	WK 3200 W*	WK 4600	WK 4600 W*	WK 7000	WK 7000 W*	WK 10000	WK 10000 W*
RS 232/485 digital interface	LWZ 033
Flow control instrument	LWZ 034	-	-	-	-	-	-	-	-	-
	LWZ 035
High-power pump 5.5 bar, 40 L/min. 60-Hz version	LWZ 031-2	-	-	-	-	-	-	-	-	-
High-power pump 5.5 bar, 40 L/min. 60-Hz version	LWZ 032-2	-

* W = water-cooled version

Options ex works: WK circulation chillers down to -30 °C

	Cat.-No.:	WKL 230	WKL 600	WKL 603	WKL 900	WKL 903	WKL 1000	WKL 1200	WKL 1200 W*	WKL 2200
Enlarged temperature range down to -25 °C	LWZ 030	-	-	-	-	-	-
RS 232/485 digital interface	LWZ 033	-
Flow control instrument	LWZ 034	-						v	-	-
	LWZ 035	-	-	-	-	-	-
	LWZ 036	-	-	-	-	-	-	-	-	-
Low-pressure pump 1 bar, 30 L/min. 60-Hz version	LWZ 041-2	-	-	-	-	-	-
High-power pump 5.5 bar, 40 L/min. 60-Hz version	LWZ 031-2	-	-	-	-	-	-
High-power pump 5.5 bar, 40 L/min. 60-Hz version	LWZ 032-2	-	-	-	-	-	-	-	-	-

	Cat.-No.:	WKL 2200 W*	WKL 3200	WKL 3200 W*	WKL 4600	WKL 4600 W*	WKL 7000	WKL 7000 W*	WKL 10000	WKL 10000 W*
Enlarged temperature range down to -25 °C	LWZ 030					-	-	-	-	-
RS 232/485 digital interface	LWZ 033
Flow control instrument	LWZ 034	-	-	-	-	-	-	-	-	-
	LWZ 035						-	-	-	-
	LWZ 036	-	-	-	-	-
Low-pressure pump 1 bar, 30 L/min. 60-Hz version	LWZ 041-2		-	-	-	-	-	-	-	-
High-power pump 5.5 bar, 40 L/min. 60-Hz version	LWZ 031-2		-	-	-	-	-	-	-	-
High-power pump 5.5 bar, 40 L/min. 60-Hz version	LWZ 032-2	-					-	-	-	-

* W = water-cooled version