PTLDUltra-Low Temperature

PTLD Series Low-Temperature Chiller

Cascade refrigeration · down to -110℃

Cascade refrigeration reaching -110℃ for demanding low-temperature processes and research.

Medium temperature-110℃ ~ -30℃
Cooling capacity0.5~15.9kW
RefrigerationCascade system
Control accuracy±0.1℃ (option)
ProtectionMulti-level alarms

Overview

The PTLD low-temperature chiller comprises a refrigeration system, circulation system, control system and enclosure. Refrigeration is vapour-compression, with compressors and key components from established international brands. The circulation system includes the pump, buffer vessel, expansion vessel, vent and check valves, RTD sensors and piping. PID control with a high-definition touchscreen and multiple protective functions ensures safe operation. The unit both cools and heats, delivering heat-transfer fluid that matches process conditions. By default it holds temperature by compressor cycling, with a user-settable differential; an optional electric-heating version achieves up to ±0.1℃ accuracy, with heater power specified to order.

Features

01Medium temperature down to -120℃
02Fully sealed system: no oil mist or odour, long fluid life
03Cascade design for high refrigeration efficiency
04Fully foamed insulation — no surface condensation
05Optional precision version: ±0.1℃ outlet, ±0.5℃ material
06Automatic venting via built-in solenoid — no manual bleeding
07Pump outlet pressure monitoring and protection
08Custom control programs supported

Typical Applications

Low-temperature control in chemical, pharmaceutical and life sciences
Distillation, crystallisation and purification systems
Cooling source for cryogenic gas condensation and recovery
Food freeze-drying
Low-temperature synthesis reactor control
Low-temperature testing of new materials
Low-temperature source for crystallisation systems

Working Principle

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

Model Designation

PTLD—D0.5WN

1. Product series code
2. Temperature code: D -60 to -30℃, F -80 to -50℃, H -100 to -70℃, J -110 to -80℃
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.

SpecificationsPTLD Series -60℃

Model		PTLD-D05	PTLD-D1	PTLD-D1.5	PTLD-D2.5	PTLD-D3.5	PTLD-D5	PTLD-D7	PTLD-D10
Medium temperature range		-60℃ to -30℃
Cooling capacity kW	-40℃	1.1	1.7	2.5	4.2	5.8	8.5	11.5	15.9
Cooling capacity kW	-55℃	0.5	1	1.5	2.5	3.5	5	7	10
Optional heating power kW		1.5	2.5	3.5	5.5	7.5	10	15	15
Max. pump flow L/min		15	30	40	45	60	90	150	200
Max. pump head m		20	30	30	35	35	35	35	35
Expansion tank volume L		5	10	15	20	25	30	40	50
Buffer tank volume L		3	5	7.5	10	15	20	25	30
Controlled variable		Unit outlet temperature control
Control accuracy		On/off control, settable to ±2℃ (with optional electric-heating precision model, accuracy up to ±0.1℃)
Communication		RS485 interface as standard, Modbus RTU protocol
Temperature feedback		PT100 feedback on the heat-transfer medium (inlet and outlet temperature)
HMI		7-inch colour touchscreen, Chinese/English UI, intuitive operation, displays and logs temperature curves and test data
Protection		Real-time status display and automatic fault diagnosis with multi-level alarms: earth leakage, power failure, circulation-pump overload, compressor overload, high/low refrigerant pressure, supply/return temperature difference exceeded, abnormal pump pressure, temperature module fault and sensor fault.
Circulation circuit		SUS304, fully sealed circuit design
Refrigerant		Stage 1 R404A / Stage 2 R23
Port size		G1/2	G3/4	G3/4	G1	G1	DN32	DN32	DN40
Water-cooled (suffix W)	Flow m³/h	2	2.5	3.5	4.5	5.5	7	9	12
	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	G1	G1-1/4	G1-1/4	DN32	DN32	DN40
Dimensions, water-cooled cm		75×55×145	75×55×145	85×55×145	85×55×145	90×65×155	90×65×155	115×75×175	125×85×195
Dimensions, air-cooled cm		85×55×145	85×55×145	90×65×155	90×65×155	115×75×175	115×75×175	125×85×195	155×100×225
Weight, air-cooled kg		205	235	305	335	450	485	585	895
Enclosure		Powder-coated cold-rolled steel (standard RAL 9016, SUS304 optional)
Power supply ph/v/Hz		3/380/50
Connected load kW		3	4.5	6.5	9	12	16	20	24
Option 1		Optional auxiliary electric heating for precision control, model suffix T
Option 2		Explosion-proof design (pressurised type suffix Exp, flameproof type suffix Exd)

※ Notes

Cooling capacities are based on 20℃ cooling-water inlet temperature; air-cooled units at 20℃ ambient.
Flow and head figures apply to water at 20℃; pump performance varies with the density and temperature of the medium.
Expansion tank volumes are indicative and depend on load, pipe length and height difference. Fill to no more than 2/3 and no less than 1/4 of the sight-glass scale.
Buffer tank volumes are indicative and can be adjusted to the required ramp rate and thermal storage.
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.

SpecificationsPTLD Series -80℃

Model		PTLD-F05	PTLD-F1	PTLD-F1.5	PTLD-F2.5	PTLD-F3.5	PTLD-F5	PTLD-F7	PTLD-F10
Medium temperature range		-80℃ to -50℃
Cooling capacity kW	-60℃	0.9	1.6	2.3	3.5	5.5	8.2	12	15.5
Cooling capacity kW	-75℃	0.5	1	1.5	2.5	3.5	5	7	10
Optional heating power kW		2.5	3.5	5.5	7.5	10	15	20	25
Max. pump flow L/min		25	35	50	60	90	100	200	250
Max. pump head m		20	30	30	35	35	35	35	35
Expansion tank volume L		7.5	10	15	20	30	55	75	100
Buffer tank volume L		5	7.5	10	15	20	25	35	50
Controlled variable		Unit outlet temperature control
Control accuracy		On/off control, settable to ±2℃ (with optional electric-heating precision model, accuracy up to ±0.1℃)
Communication		RS485 interface as standard, Modbus RTU protocol
Temperature feedback		PT100 feedback on the heat-transfer medium (inlet and outlet temperature)
HMI		7-inch colour touchscreen, Chinese/English UI, intuitive operation, displays and logs temperature curves and test data
Protection		Real-time status display and automatic fault diagnosis with multi-level alarms: earth leakage, power failure, circulation-pump overload, compressor overload, high/low refrigerant pressure, supply/return temperature difference exceeded, abnormal pump pressure, temperature module fault and sensor fault.
Circulation circuit		SUS304, fully sealed circuit design
Refrigerant		Stage 1 R404A / Stage 2 R508B
Port size		G3/4	G1	G1	G1	DN32	DN40	DN40	DN50
Water-cooled (suffix W)	Flow m³/h	2.5	4	6	8	9	15	20	30
	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	G1-1/4	G1-1/4	DN40	DN50	DN50	DN65
Dimensions, water-cooled cm		75×55×145	85×55×145	85×55×145	90×65×155	90×65×155	115×75×175	125×85×195	125×85×195
Dimensions, air-cooled cm		85×55×145	90×65×155	90×65×155	115×75×175	115×75×175	125×85×195	155×100×225	155×100×225
Weight, air-cooled kg		235	305	335	450	485	585	895	915
Enclosure		Powder-coated cold-rolled steel (standard RAL 9016, SUS304 optional)
Power supply ph/v/Hz		3/380/50
Connected load kW		4	6	8.5	12	16	22	30	45
Option 1		Optional auxiliary electric heating for precision control, model suffix T
Option 2		Explosion-proof design (pressurised type suffix Exp, flameproof type suffix Exd)

※ Notes

Cooling capacities are based on 20℃ cooling-water inlet temperature; air-cooled units at 20℃ ambient.
Flow and head figures apply to water at 20℃; pump performance varies with the density and temperature of the medium.
Expansion tank volumes are indicative and depend on load, pipe length and height difference. Fill to no more than 2/3 and no less than 1/4 of the sight-glass scale.
Buffer tank volumes are indicative and can be adjusted to the required ramp rate and thermal storage.
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.

SpecificationsPTLD Series -100℃

Model		PTLD-H05W	PTLD-H1W	PTLD-H1.5W	PTLD-H2.5W	PTLD-H3.5W	PTLD-H5W	PTLD-H7W	PTLD-H10W
Medium temperature range		-100℃ to -70℃
Cooling capacity kW	-80℃	0.8	1.6	2.3	3.8	5.7	8.2	11.5	15.5
Cooling capacity kW	-95℃	0.5	1	1.5	2.5	3.5	5	7	10
Optional heating power kW		2.5	3.5	5.5	7.5	10	15	20	25
Max. pump flow L/min		25	35	50	60	90	100	200	250
Max. pump head m		20	30	30	35	35	35	35	35
Expansion tank volume L		10	15	20	30	40	55	75	100
Buffer tank volume L		5	10	15	20	25	30	40	50
Controlled variable		Unit outlet temperature control
Control accuracy		On/off control, settable to ±2℃ (with optional electric-heating precision model, accuracy up to ±0.1℃)
Communication		RS485 interface as standard, Modbus RTU protocol
Temperature feedback		PT100 feedback on the heat-transfer medium (inlet and outlet temperature)
HMI		7-inch colour touchscreen, Chinese/English UI, intuitive operation, displays and logs temperature curves and test data
Protection		Real-time status display and automatic fault diagnosis with multi-level alarms: earth leakage, power failure, circulation-pump overload, compressor overload, high/low refrigerant pressure, supply/return temperature difference exceeded, abnormal pump pressure, temperature module fault and sensor fault.
Circulation circuit		SUS304, fully sealed circuit design
Refrigerant		Mixed refrigerant
Port size		G3/4	G1	DN32	DN32	DN40	DN40	DN40	DN50
Water-cooled (suffix W)	Flow m³/h	3	4.5	5.5	7.5	10.5	15	22	28
	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	G1	G1-1/4	DN32	DN40	DN40	DN50	DN65
Dimensions, water-cooled cm		90×65×155	90×65×155	115×75×175	115×75×175	125×85×195	155×100×225	155×100×225	200×120×255
Weight kg		305	335	450	485	585	895	915	1355
Enclosure		Powder-coated cold-rolled steel (standard RAL 9016, SUS304 optional)
Power supply ph/v/Hz		3/380/50
Connected load kW		7	9	12	16	23	35	46	65
Option 1		Optional auxiliary electric heating for precision control, model suffix T
Option 2		Explosion-proof design (pressurised type suffix Exp, flameproof type suffix Exd)

※ Notes

Cooling capacities are based on 20℃ cooling-water inlet temperature; air-cooled units at 20℃ ambient.
Flow and head figures apply to water at 20℃; pump performance varies with the density and temperature of the medium.
Expansion tank volumes are indicative and depend on load, pipe length and height difference. Fill to no more than 2/3 and no less than 1/4 of the sight-glass scale.
Buffer tank volumes are indicative and can be adjusted to the required ramp rate and thermal storage.
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.

SpecificationsPTLD Series -110℃

Model		PTLD-J05W	PTLD-J1W	PTLD-J1.5W	PTLD-J2.5W	PTLD-J3.5W	PTLD-J5W	PTLD-J7W	PTLD-J10W
Medium temperature range		-110℃ to -80℃
Cooling capacity kW	-90℃	0.9	1.8	2.5	4.2	5.8	8.5	11.5	15.5
Cooling capacity kW	-105℃	0.5	1	1.5	2.5	3.5	5	7	10
Optional heating power kW		2.5	3.5	5.5	7.5	10	15	20	25
Max. pump flow L/min		35	50	60	90	100	200	250	300
Max. pump head m		30	30	35	35	35	35	35	35
Expansion tank volume L		15	20	30	40	55	75	100	150
Buffer tank volume L		10	15	20	30	40	50	75	100
Controlled variable		Unit outlet temperature control
Control accuracy		On/off control, settable to ±2℃ (with optional electric-heating precision model, accuracy up to ±0.1℃)
Communication		RS485 interface as standard, Modbus RTU protocol
Temperature feedback		PT100 feedback on the heat-transfer medium (inlet and outlet temperature)
HMI		7-inch colour touchscreen, Chinese/English UI, intuitive operation, displays and logs temperature curves and test data
Protection		Real-time status display and automatic fault diagnosis with multi-level alarms: earth leakage, power failure, circulation-pump overload, compressor overload, high/low refrigerant pressure, supply/return temperature difference exceeded, abnormal pump pressure, temperature module fault and sensor fault.
Circulation circuit		SUS304, fully sealed circuit design
Refrigerant		Mixed refrigerant
Port size		G1	G1	G1	DN32	DN32	DN40	DN50	DN50
Water-cooled (suffix W)	Flow m³/h	5	8	10.5	14	18	22	27	35
	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	G1-1/4	G1-1/4	DN40	DN40	DN50	DN50	DN65	DN80
Dimensions, water-cooled cm		115×75×175	115×75×175	125×85×195	155×100×225	155×100×225	200×120×235	255×155×255	300×175×255
Weight kg		450	485	585	855	925	1405	2205	3000
Enclosure		Powder-coated cold-rolled steel (standard RAL 9016, SUS304 optional)
Power supply ph/v/Hz		3/380/50
Connected load kW		8.5	12	17	25	35	48	71	105
Option 1		Optional auxiliary electric heating for precision control, model suffix T
Option 2		Explosion-proof design (pressurised type suffix Exp, flameproof type suffix Exd)

※ Notes

Cooling capacities are based on 20℃ cooling-water inlet temperature; air-cooled units at 20℃ ambient.
Flow and head figures apply to water at 20℃; pump performance varies with the density and temperature of the medium.
Expansion tank volumes are indicative and depend on load, pipe length and height difference. Fill to no more than 2/3 and no less than 1/4 of the sight-glass scale.
Buffer tank volumes are indicative and can be adjusted to the required ramp rate and thermal storage.
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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