PTZLDirect Phase-Change Cooling

PTZL Series Direct-Cooling Unit

Direct refrigerant evaporation · fast, efficient, compact

For vacuum-coating cold traps, semiconductor chip testing, thermal-sink trials, low-temperature baths, gas trapping and pharmaceutical freeze-drying.

Working temperature-150℃ ~ -10℃
Cooling capacity0.2~2kW
Control accuracy±0.5℃
Control modePID control
DefrostHot-gas defrost

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Overview

The PTZL direct-cooling unit contains no evaporator of its own. Low-temperature, low-pressure liquid refrigerant is piped to the customer load, which serves as the evaporator. There the refrigerant evaporates, absorbing heat and bringing the load rapidly to the target temperature. Because cooling happens by phase change rather than by a temperature difference across a liquid loop, cool-down is faster and efficiency higher — and with no circulation system the unit is far more compact.

Features

01Customisable anywhere from -150 to 35℃
02Controls evaporating pressure or outlet temperature for high stability
03Hot-gas defrost keeps defrost cycles short
04Fully foamed insulation — no surface condensation
05Highly repeatable control improves production stability
06Adaptive PID control algorithm

Typical Applications

Thermal-sink low-temperature trials
Food freeze-drying and cold storage
Low-temperature chip testing
Component environmental testing
Vacuum-coating cold traps

Working Principle

※ Note: the flow diagram is simplified and may differ from the actual unit.

Model Designation

PTZL—D0.5WN

1. Product series code
2. Temperature code: C -40 to -10℃, D -60 to -20℃, F -80 to -50℃, H -100 to -60℃, J -120 to -80℃, L -150 to -110℃
3. Capacity code: cooling capacity at 5℃ above the minimum outlet temperature, e.g. 0.5 kW at -55℃
4. Condensing: W for water-cooled; air-cooled is not marked
5. Non-standard code: see the non-standard code rules; omitted if not required

Specifications

Data taken from the GPTECH product catalogue. Contact us for other models or custom specifications.

SpecificationsPTZL Series -40℃

Model		PTZL-C02	PTZL-C05	PTZL-C1	PTZL-C1.5	PTZL-C2
Working temperature		-40℃ to -10℃
Cooling capacity kW @-40℃		0.2	0.5	1	1.5	2
Control system		PLC controller with intelligent PID temperature module for precise control and real-time display
Control mode		PID control
Communication		RS485 interface, Modbus RTU protocol
External inputs		External temperature sensor port (PT100 standard), USB data port
Temperature feedback		Refrigerant outlet temperature, refrigerant return temperature, external measured temperature
Control accuracy		±0.5℃
HMI		7-inch touchscreen, Chinese UI, intuitive operation, displays and logs temperature curves and test data
Protection		Real-time status display and automatic fault diagnosis with multi-level alarms: power failure, compressor overload, high/low refrigerant pressure, over-current, over-temperature and sensor fault.
Refrigerant		R404A
Connection pipe size	Liquid line mm	6	10	10	12	12
Connection pipe size	Suction line mm	10	12	16	16	16
Water-cooled (suffix W)	Flow m³/h	0.5	0.8	1.5	2.2	3
	Water temp.	Flow rates are calculated at 20℃ water temperature. Cooling water inlet must stay between 5℃ and 30℃, otherwise unit operation is affected.
	Pressure	2–4.5 bar
	Port size	G1/2	G1/2	G1/2	G3/4	G1
Dimensions, water-cooled cm		55×45×70	55×45×70	60×45×125	75×55×145	85×55×145
Dimensions, air-cooled cm		55×45×70	60×45×125	75×55×145	85×55×145	90×65×155
Weight, air-cooled kg		75	105	145	205	295
Enclosure		Powder-coated cold-rolled steel (standard RAL 9016, SUS304 optional)
Power supply ph/v/Hz		1/220/50	3/380/50
Connected load kW		0.85	1.3	2.5	3.2	4.5

※ Notes

Cooling capacities are based on 20℃ cooling-water inlet temperature; air-cooled units at 20℃ ambient.
Only part of the product range is listed. For other models or customised requirements please contact our sales team. Specifications are subject to change without notice.

SpecificationsPTZL Series -80℃

Model		PTZL-F02	PTZL-F05	PTZL-F1	PTZL-F1.5	PTZL-F2
Working temperature		-80℃ to -50℃
Cooling capacity kW @-75℃		0.2	0.5	1	1.5	2
Control system		PLC controller with intelligent PID temperature module for precise control and real-time display
Control mode		PID control
Communication		RS485 interface, Modbus RTU protocol
External inputs		External temperature sensor port (PT100 standard), USB data port
Temperature feedback		Refrigerant outlet temperature, refrigerant return temperature, external measured temperature
Control accuracy		±0.5℃
HMI		7-inch touchscreen, Chinese UI, intuitive operation, displays and logs temperature curves and test data
Protection		Real-time status display and automatic fault diagnosis with multi-level alarms: power failure, compressor overload, high/low refrigerant pressure, over-current, over-temperature and sensor fault.
Refrigerant		R404A/R23
Connection pipe size	Liquid line mm	6	10	10	12	12
Connection pipe size	Suction line mm	10	12	16	16	16
Water-cooled (suffix W)	Flow m³/h	0.6	1.1	2.5	3.8	5.5
	Water temp.	Flow rates are calculated at 20℃ water temperature. Cooling water inlet must stay between 5℃ and 30℃, otherwise unit operation is affected.
	Pressure	2–4.5 bar
	Port size	G1/2	G1/2	G3/4	G1	DN32
Dimensions, water-cooled cm		60×45×125	60×45×125	75×55×145	85×55×145	90×65×155
Dimensions, air-cooled cm		60×45×125	75×55×145	85×55×145	90×65×155	115×75×175
Weight, air-cooled kg		105	145	205	295	355
Enclosure		Powder-coated cold-rolled steel (standard RAL 9016, SUS304 optional)
Power supply ph/v/Hz		1/220/50	3/380/50
Connected load kW		2	3.2	6.5	9	13

※ Notes

Cooling capacities are based on 20℃ cooling-water inlet temperature; air-cooled units at 20℃ ambient.
Only part of the product range is listed. For other models or customised requirements please contact our sales team. Specifications are subject to change without notice.

SpecificationsPTZL Series -120℃

Model		PTZL-J02W	PTZL-J05W	PTZL-J1W	PTZL-J1.5W	PTZL-J2W
Working temperature		-120℃ to -80℃
Cooling capacity kW @-115℃		0.2	0.5	1	1.5	2
Control system		PLC controller with intelligent PID temperature module for precise control and real-time display
Control mode		PID control
Communication		RS485 interface, Modbus RTU protocol
External inputs		External temperature sensor port (PT100 standard), USB data port
Temperature feedback		Refrigerant outlet temperature, refrigerant return temperature, external measured temperature
Control accuracy		±0.5℃
HMI		7-inch touchscreen, Chinese UI, intuitive operation, displays and logs temperature curves and test data
Protection		Real-time status display and automatic fault diagnosis with multi-level alarms: power failure, compressor overload, high/low refrigerant pressure, over-current, over-temperature and sensor fault.
Refrigerant		Mixed refrigerant
Connection pipe size	Liquid line mm	10	10	12	12	12
Connection pipe size	Suction line mm	12	12	16	16	16
Water-cooled (suffix W)	Flow m³/h	2.5	3.8	6	8	10
	Water temp.	Flow rates are calculated at 20℃ water temperature. Cooling water inlet must stay between 5℃ and 30℃, otherwise unit operation is affected.
	Pressure	2–4.5 bar
	Port size	G3/4	G1	DN32	DN32	DN40
Dimensions, water-cooled cm		75×55×145	85×55×145	90×65×155	125×85×195	155×100×225
Weight kg		155	225	305	355	485
Enclosure		Powder-coated cold-rolled steel (standard RAL 9016, SUS304 optional)
Power supply ph/v/Hz		3/380/50
Connected load kW		3	5.5	12	23	35

※ Notes

Cooling capacities are based on 20℃ cooling-water inlet temperature; air-cooled units at 20℃ ambient.
Only part of the product range is listed. For other models or customised requirements please contact our sales team. Specifications are subject to change without notice.

SpecificationsPTZL Series -150℃

Model		PTZL-L02W	PTZL-L05W	PTZL-L1W	PTZL-L1.5W	PTZL-L2W
Working temperature		-150℃ to -110℃
Cooling capacity kW @-145℃		0.2	0.5	1	1.5	2
Control system		PLC controller with intelligent PID temperature module for precise control and real-time display
Control mode		PID control
Communication		RS485 interface, Modbus RTU protocol
External inputs		External temperature sensor port (PT100 standard), USB data port
Temperature feedback		Refrigerant outlet temperature, refrigerant return temperature, external measured temperature
Control accuracy		±0.5℃
HMI		7-inch touchscreen, Chinese UI, intuitive operation, displays and logs temperature curves and test data
Protection		Real-time status display and automatic fault diagnosis with multi-level alarms: power failure, compressor overload, high/low refrigerant pressure, over-current, over-temperature and sensor fault.
Refrigerant		Mixed refrigerant
Connection pipe size	Liquid line mm	10	10	12	12	12
Connection pipe size	Suction line mm	12	12	16	16	16
Water-cooled (suffix W)	Flow m³/h	3.5	5.5	8	10.5	15
	Water temp.	Flow rates are calculated at 20℃ water temperature. Cooling water inlet must stay between 5℃ and 30℃, otherwise unit operation is affected.
	Pressure	2–4.5 bar
	Port size	G1	DN32	DN40	DN40	DN50
Dimensions, water-cooled cm		85×55×145	90×65×155	125×85×195	155×100×225	205×150×225
Weight kg		235	315	405	585	855
Enclosure		Powder-coated cold-rolled steel (standard RAL 9016, SUS304 optional)
Power supply ph/v/Hz		3/380/50
Connected load kW		5.5	12	33	48	65

※ Notes

Cooling capacities are based on 20℃ cooling-water inlet temperature; air-cooled units at 20℃ ambient.
Only part of the product range is listed. For other models or customised requirements please contact our sales team. Specifications are subject to change without notice.

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