Laser Diode
Thermoelectric
Chiller

Specifications6
Cooling Capacity:1
Power Consumption:

Product Features

LDT-53520

LDT-53540

LDT-53522

LDT-53542

200W
850W

375W
1300W

200W
850W

375W
1300W

THERMAL PERFORMANCE
Thermal PerformanceControl Temperature Range:3
Temperature Stability:1,2
Temperature Accuracy:1,5

SOFTWARE / FIRMWARE / COMMUNICATIONSoo-5 C to 45 C
±0.05oC±0.2oCoExternal Communication:
Virtual Front Panel:o-5 C to 45 C
±0.05oC±0.2oC

Fluid Type:
Flow Rate:4
Reservoir Capacity:
Flow Measurement Range:
Flow Measurement Accuracy:
Fluid Interconnects:

Size (H x W x D):
Weight:15.5” x 11” x 13”
47 lbs (LDM-53520; LDT-53522)
57 lbs (LDM-53540; LDT-53542)
Operating Temperature:
23oC + 5oC
Storage Temperature:-25oC to + 65oC
Humidity:<80% RH - non-condensing
Input Power (LDT-53520; LDT-53540): 110V; 50Hz; single phase
Input Power (LDT-53522; LDT-53542): 220V; 50Hz; single phase
Noise:<66 dBADistilled water or distilled water mixed with<30% isopropyl alcohol or propylene glycol
2 LPM @ 3m H20
300 - 400 ml
0.8 - 4.0 LPM±20%
Colder Products Quick Disconnect
with Check Valve

REGULATORYEXTERNAL TEMPERATURE SENSORS
External Sensor Selector:
External Sensor Connection:
Thermistor
Type:
Usable Range:
Current Source:
Calibration:
IC Sensors:
Type:
Calibration:
SourceAD590:LM335

CE:
Certifications:

4 Pole Switch
15 Pin, D-Sub, Female
2-Wire NTC
450 - 350 k
10 / 100 A selectable source
Steinhart-Hart (2 constants)

Audible Alarm States:
Mute:

1. Temperature set point (internal) set to ambient and thermal load coupledclosely to the inlet and outlet ports.
2. Stability measured with a 200W thermal load (LDT-53540) and a
100W thermal load (LDT-53520) using an internal thermistor.
3. Operation below 5oC requires the addition of isopropyl alcohol (<30%) or
propylene glycol (<30%) to prevent freezing. Isopropyl alcohol is effective down
to 0oC. To operate below 0oC, propylene glycol must be used.
4. Flow characteristics at 60Hz. Output will be lower at 50Hz.
5. External temperature measurement accuracy for AD590 and LM335 sensors
will be +0.2°C and +1.0°C respectively.
6. All specifications are after a one hour warm-up / stabilization time.

AD590 / LM335
2 - Point
8V
0.6mA

Water Level Low; Flow Stops; Over Temp
Set Point; Output Off
Level Sense Low; Over Temperature Set Point
Mute button to disable audible alarm

Terminal Block
Normally Open
Normally Closed
No Flow; Over Temp Set Point; Output Off

REMOVABLE FRONT PANEL
Size:
Display:
Remote Connector:
Remote Cable:

Recirculating chillers with 200W
and 375W models
TEC based temperature control
from -5oC to 45oC with 0.05oC
stability
High power laser diode protection
with multiple safety interlocks
Variable speed fan for quiet
operation
USB 2.0 computer interface
Removable front panel for remotecontrol
Coolant flow measurement andreadout

The LDT-53500 Series of Laser Diode Thermoelectric Chillers
are designed specifically for high power laser diode temperature
control applications. Four models are available with 200W and375W cooling capacity and provide high temperature stability for
precise high power laser diode temperature control. Heat andcool modes of operation provide temperature control over a rangeof -5oC to 45oC. Standard features include safety interlocks, aremovable front panel for remote control, external temperaturesensing, and flow measurement.
The LDT-53500 Series has been optimized for protecting
high power laser diodes. Laser diode protection is provided
through multiple interlocks which are compatible with ILX highpower laser diode drivers. The interlocks will change states inthe event of loss of flow, over temperature limit, and if the chiler
output is disabled.
For easy integration into automated test applications, theLDT-53500 comes standard with a USB 2.0 computer interface
and front panel USB graphical user interface.

ORDERING INFORMATIONINTERLOCKS
Connector:
Interlock 1:
Interlock 2:
Interlock States (triggered):LDT-53522 and LDT-53542 only
Low Voltage Directive 73/23/EEC;
EN61010-1:2001;
Electromagnetic Compatibility 89/336/EEC;
EN61326-2006

NOTES

ERRORS / ALARMS
Error States:USB
C# application communicates thru USB

GENERALFLUID / FLOW SPECIFICATIONS

2U x 6” wide - rack mountable
4 digit 7 - segment LED
RJ45 - 8 Conductor
Ethernet

LDT-53520
LDT-53540
LDT-53522
LDT-53542

200W Laser Diode Thermoelectric Chiller
375W Laser Diode Thermoelectric Chiller
200W 220V Laser Diode Thermoelectric Chiller
375W 220V Laser Diode Thermoelectric Chiller

LDM-49840
LDM-49840THigh Power Butterfly Laser Diode Mount
High Power Butterfly Laser Diode Mount with
Case Temperature Control
High Power 2-Pin Module Laser Diode Mount
High Power 2-Pin Module Laser Diode Mount with
Case Temperature Control
CS Bar Package Mounting FixtureHigh Power Laser Diode DriverHigh Power Precision Current Source

LDM-49860
LDM-49860T
LDM-4415
LDX-36000 Series
LDX-32420

Cooling Power versus DT
450
400
53540

350

53520

300
Power (W)

LDT
53500
Series

250
200
150
100
50
0
0

5

10

15
20
25
DT (T-Ambient - T-Fluid)30

35

For information call
P.O. Box 6310, Bozeman, MT 59771 • FAX: 406-586-9405

www.ilxlightwave.com

1-800-459-9459
International Inquiries: 406-556-2481
email: sales@ilxlightwave.com

Rev03.020310

Safe, affordable temperature control forhigh power laser diodes

LDT
53500
SeriesLaser Diode
Thermoelectric
Chiller

LDT
53500
SeriesLaser Diode
Thermoelectric
Chiller

LDT
53500
SeriesDESIGNED TO PROTECT HIGH POWER
LASER DIODESThe new LDT-53500 Laser Diode Thermoelectric Chiller
is specifically designed to provide protection to yourhigh power laser diodes. Protection features include
normally open and normally closed interlocks andmultiple fault monitoring circuits. When the interlocks
are used with ILX Lightwave high power laser diodedrivers, the laser is protected if a chiller fault occurs.
The interlocks will change states in the event of lossof flow, over temperature limits, and if the chiller output
is disabled.
Front panel fault indicators clearly identify low reservoir,
over temperature limit, and loss of flow. An audible
alarm will notify the user of a low reservoir and overtemperature limit. The alarm can be silenced via a front
panel mute button.

PRECISION TEMPERATURE CONTROLHeat and cool modes of operation provide stabletemperature control over a range of -5oC to 45oC. The
heat exchanger design and optimized PID control loop
constants provide temperature stability of +0.05oC at
the water outlet.

The chiller can monitor a thermistor or RTD sensor near
the laser diode and use that sensor as the feedback
control, allowing for more accurate temperature control
at the device under test. The user can enter in Steinhart-Hart constants for calibrated thermistors.

COOLANT FLOW MEASUREMENT
A unique flow sensor developed at ILX monitors for lossof coolant flow and also has the ability to measure flow.
This internal flow sensor eliminates the need for external
flow sensors that can reduce the overall coolant pressureof the chiller. Measured flow can be displayed on boththe front panel and via the USB interface.

Laser Diode
Thermoelectric
Chiller
LDX-36000 High Power Laser Diode Driver

QUICK AND EASY SETUP
The intuitive front panel and use of quick water
disconnects enable the user to quickly set up either LDT53500 model. A bright 7-segment LED display is highly
visible from a distance in darkened labs. Connecting the
LDT-53500 chiller interlock to a laser diode driver suchas the LDX-36000 is accomplished by connecting wires
from the 53500 terminal blocks located on the rear of thechiller to the driver’s interlock terminal blocks.

To ensure protection of expensive high power laser diodes from chiller faults,
the LDT-53500 interlock can be connected to an ILX high power laser diode driver interlock.

REMOTE CONTROLQUIET OPERATIONThe LDT-53500 Laser Diode Thermoelectric Chiller hasa unique removable front panel to allow users to place
the chiller in a convenient location with the front panel
near the application. The front panel communicates tothe LDT-53500 chassis via a standard RJ45 connector.
In addition to the removable front panel, the LDT-53500
comes standard with a USB interface for remote control
from a computer. A GUI interface is included with theLDT-53500 support application CD or can be downloaded
from the ILX website.

To reduce noise in the lab, the pump and fanswere selected for performance and quiet operation.
Also to eliminate excessive noise, the fan speed is
automatically adjusted in response to the amountof heat being removed by the chiller. This allows forquieter operation when the chiller in not being operated
at the maximum thermal load.

SAFE AND RELIABLE OPERATIONThe LDT-53500 is designed for long lifetimes by the useof thermoelectric modules. Thermoelectric modules
eliminate additional moving parts that can lead to
expensive or costly repairs in compressor based chillers.
Thermoelectric module lifetimes have exceeded hundredsof thousands of hours. The choice of the only moving
parts, the pump and the fan, were carefully selected toprovide long lifetime in continuous operation.

LDT-53500 Front Panel Display

PUT OUR EXPERTISE TO WORKILX Lightwave is a recognized world leader in Laser
Diode Instrumentation and Test Systems. Our products
are not only renowned for their reliability, quality, andvalue; they’re backed by industry leading after-sales
support.
For more information about the LDT-53500 Laser Diode
Thermoelectric Chiller, and our complete family of
Laser Diode Instrumentation and Test Systems, call us
today or visit our website www.ilxlightwave.com.

LDT
53500
SeriesLaser Diode
Thermoelectric
Chiller

LDT
53500
SeriesDESIGNED TO PROTECT HIGH POWER
LASER DIODESThe new LDT-53500 Laser Diode Thermoelectric Chiller
is specifically designed to provide protection to yourhigh power laser diodes. Protection features include
normally open and normally closed interlocks andmultiple fault monitoring circuits. When the interlocks
are used with ILX Lightwave high power laser diodedrivers, the laser is protected if a chiller fault occurs.
The interlocks will change states in the event of lossof flow, over temperature limits, and if the chiller output
is disabled.
Front panel fault indicators clearly identify low reservoir,
over temperature limit, and loss of flow. An audible
alarm will notify the user of a low reservoir and overtemperature limit. The alarm can be silenced via a front
panel mute button.

PRECISION TEMPERATURE CONTROLHeat and cool modes of operation provide stabletemperature control over a range of -5oC to 45oC. The
heat exchanger design and optimized PID control loop
constants provide temperature stability of +0.05oC at
the water outlet.

The chiller can monitor a thermistor or RTD sensor near
the laser diode and use that sensor as the feedback
control, allowing for more accurate temperature control
at the device under test. The user can enter in Steinhart-Hart constants for calibrated thermistors.

COOLANT FLOW MEASUREMENT
A unique flow sensor developed at ILX monitors for lossof coolant flow and also has the ability to measure flow.
This internal flow sensor eliminates the need for external
flow sensors that can reduce the overall coolant pressureof the chiller. Measured flow can be displayed on boththe front panel and via the USB interface.

Laser Diode
Thermoelectric
Chiller
LDX-36000 High Power Laser Diode Driver

QUICK AND EASY SETUP
The intuitive front panel and use of quick water
disconnects enable the user to quickly set up either LDT53500 model. A bright 7-segment LED display is highly
visible from a distance in darkened labs. Connecting the
LDT-53500 chiller interlock to a laser diode driver suchas the LDX-36000 is accomplished by connecting wires
from the 53500 terminal blocks located on the rear of thechiller to the driver’s interlock terminal blocks.

To ensure protection of expensive high power laser diodes from chiller faults,
the LDT-53500 interlock can be connected to an ILX high power laser diode driver interlock.

REMOTE CONTROLQUIET OPERATIONThe LDT-53500 Laser Diode Thermoelectric Chiller hasa unique removable front panel to allow users to place
the chiller in a convenient location with the front panel
near the application. The front panel communicates tothe LDT-53500 chassis via a standard RJ45 connector.
In addition to the removable front panel, the LDT-53500
comes standard with a USB interface for remote control
from a computer. A GUI interface is included with theLDT-53500 support application CD or can be downloaded
from the ILX website.

To reduce noise in the lab, the pump and fanswere selected for performance and quiet operation.
Also to eliminate excessive noise, the fan speed is
automatically adjusted in response to the amountof heat being removed by the chiller. This allows forquieter operation when the chiller in not being operated
at the maximum thermal load.

SAFE AND RELIABLE OPERATIONThe LDT-53500 is designed for long lifetimes by the useof thermoelectric modules. Thermoelectric modules
eliminate additional moving parts that can lead to
expensive or costly repairs in compressor based chillers.
Thermoelectric module lifetimes have exceeded hundredsof thousands of hours. The choice of the only moving
parts, the pump and the fan, were carefully selected toprovide long lifetime in continuous operation.

LDT-53500 Front Panel Display

PUT OUR EXPERTISE TO WORKILX Lightwave is a recognized world leader in Laser
Diode Instrumentation and Test Systems. Our products
are not only renowned for their reliability, quality, andvalue; they’re backed by industry leading after-sales
support.
For more information about the LDT-53500 Laser Diode
Thermoelectric Chiller, and our complete family of
Laser Diode Instrumentation and Test Systems, call us
today or visit our website www.ilxlightwave.com.

Laser Diode
Thermoelectric
Chiller

Specifications6
Cooling Capacity:1
Power Consumption:

Product Features

LDT-53520

LDT-53540

LDT-53522

LDT-53542

200W
850W

375W
1300W

200W
850W

375W
1300W

THERMAL PERFORMANCE
Thermal PerformanceControl Temperature Range:3
Temperature Stability:1,2
Temperature Accuracy:1,5

SOFTWARE / FIRMWARE / COMMUNICATIONSoo-5 C to 45 C
±0.05oC±0.2oCoExternal Communication:
Virtual Front Panel:o-5 C to 45 C
±0.05oC±0.2oC

Fluid Type:

Flow Rate:4
Reservoir Capacity:
Flow Measurement Range:
Flow Measurement Accuracy:
Fluid Interconnects:

Size (H x W x D):
Weight:15.5” x 11” x 13”
47 lbs (LDM-53520; LDT-53522)
57 lbs (LDM-53540; LDT-53542)
Operating Temperature:
23oC + 5oC
Storage Temperature:-25oC to + 65oC
Humidity:<80% RH - non-condensing
Input Power (LDT-53520; LDT-53540): 110V; 60Hz; single phase
Input Power (LDT-53522; LDT-53542): 220V; 50Hz; single phase
Noise:<66 dBADistilled water or distilled water mixed with<30% isopropyl alcohol or propylene glycol
2 LPM @ 3m H20
300 - 400 ml
0.8 - 4.0 LPM±20%
Colder Products Quick Disconnect
with Check Valve

REGULATORYEXTERNAL TEMPERATURE SENSORS

External Sensor Selector:
External Sensor Connection:
Thermistor
Type:
Usable Range:
Current Source:
Calibration:
IC Sensors:
Type:
Calibration:
SourceAD590:LM335

ERRORS / ALARMS
Error States:

Audible Alarm States:
Mute:

INTERLOCKS

Connector:
Interlock 1:
Interlock 2:
Interlock States (triggered):CE:
Certifications:

4 Pole Switch
15 Pin, D-Sub, Female

2-Wire NTC
450W - 350 kW
10 / 100 mA selectable source
Steinhart-Hart (2 constants)

LDT-53522 and LDT-53542 only
Low Voltage Directive 73/23/EEC;
EN61010-1:2001;
Electromagnetic Compatibility 89/336/EEC;
EN61326-2006

NOTES

1. Temperature set point (internal) set to ambient and thermal load coupledclosely to the inlet and outlet ports.
2. Stability measured with a 200W thermal load (LDT-53540) and a
100W thermal load (LDT-53520) using an internal thermistor.
3. Operation below 5°C requires the addition of isopropyl alcohol (<30%)or propylene glycol (<30%) to prevent freezing. Propylene glycol is effective
down to 0°C. To operate below 0°C, isopropyl alcohol must be used.4.
Flow characteristics at 60Hz. Output will be lower at 50Hz.
5. External temperature measurement accuracy for AD590 and LM335 sensors
will be +0.2°C and +1.0°C respectively.
6. All specifications are after a one hour warm-up / stabilization time.

AD590 / LM335
2 - Point
8V
0.6mA

Water Level Low; Flow Stops; Over Temp
Set Point; Output Off
Level Sense Low; Over Temperature Set Point
Mute button to disable audible alarm

Recirculating chillers with 200W
and 375W models
TEC based temperature control
from -5oC to 45oC with 0.05oC
stability
High power laser diode protection
with multiple safety interlocks
Variable speed fan for quiet
operation
USB 2.0 computer interface
Removable front panel for remotecontrol
Coolant flow measurement andreadout

The LDT-53500 Series of Laser Diode Thermoelectric Chillers
are designed specifically for high power laser diode temperature
control applications. Four models are available with 200W and375W cooling capacity and provide high temperature stability for
precise high power laser diode temperature control. Heat andcool modes of operation provide temperature control over a rangeof -5oC to 45oC. Standard features include safety interlocks, aremovable front panel for remote control, external temperaturesensing, and flow measurement.
The LDT-53500 Series has been optimized for protecting
high power laser diodes. Laser diode protection is provided
through multiple interlocks which are compatible with ILX highpower laser diode drivers. The interlocks will change states inthe event of loss of flow, over temperature limit, and if the chiler
output is disabled.
For easy integration into automated test applications, theLDT-53500 comes standard with a USB 2.0 computer interface
and front panel USB graphical user interface.

ORDERING INFORMATION

Terminal Block
Normally Open
Normally Closed
No Flow; Over Temp Set Point; Output Off

REMOVABLE FRONT PANEL
Size:
Display:
Remote Connector:
Remote Cable:

USB
C# application communicates thru USB

GENERALFLUID / FLOW SPECIFICATIONS

2U x 6” wide - rack mountable
4 digit 7 - segment LED
RJ45 - 8 Conductor
Ethernet

LDT-53520
LDT-53540
LDT-53522
LDT-53542

200W Laser Diode Thermoelectric Chiller
375W Laser Diode Thermoelectric Chiller
200W 220V Laser Diode Thermoelectric Chiller
375W 220V Laser Diode Thermoelectric Chiller

LDM-49840
LDM-49840THigh Power Butterfly Laser Diode Mount
High Power Butterfly Laser Diode Mount with
Case Temperature Control
High Power 2-Pin Module Laser Diode Mount
High Power 2-Pin Module Laser Diode Mount with
Case Temperature Control
CS Bar Package Mounting FixtureHigh Power Laser Diode DriverHigh Power Precision Current Source

LDM-49860
LDM-49860T
LDM-4415
LDX-36000 Series
LDX-32420

Cooling Power versus DT
450
400
53540

350

53520

300
Power (W)

LDT
53500
Series

250
200
150
100
50
0
0

5

10

15
20
25
DT (T-Ambient - T-Fluid)30

35

For information call
P.O. Box 6310, Bozeman, MT 59771 • FAX: 406-586-9405

www.ilxlightwave.com

1-800-459-9459
International Inquiries: 406-556-2481
email: sales@ilxlightwave.com

Rev03.122010

Safe, affordable temperature control forhigh power laser diodes

LDT
53500
SeriesLaser Diode
Thermoelectric
Chiller