Arroyo Instruments TECMount 274 User manual

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Page 2 · 274 TECMount User’s Manual
Table of Contents
Introduction .............................................................................................................3
Installation and Use.................................................................................................3
Mounting Plate ........................................................................................................4
Connector Pin-Outs.................................................................................................5
EXT Input and SENSOR Switch..............................................................................5
Technical Specifications .........................................................................................6
Wetted Materials......................................................................................................6
Thermal Performance Graph ..................................................................................7
Pressure Drop vs Flow Graph.................................................................................8
Configuring the Temperature Controller.................................................................9
Using the Thermistor on Standard Versions ..........................................................9
Using the RTD on 150°C Versions ........................................................................11
Operating at High Temperatures ..........................................................................13
Mechanical Drawings............................................................................................14
Warranty ................................................................................................................18
Service and Support .............................................................................................18

274 TECMount User’s Manual · Page 3
Introduction
Thank you for choosing the 274 TECMount from Arroyo Instruments. The 274
TECMount is designed for high performance and long term use.
The 274 TECMount integrates a high power Peltier cooler for precise control
and substantial heating and cooling capacity for your powerful devices. The
standard 274 TECMount has an operating range of -25°C to +85°C. Operation
below the dew point requires a nitrogen-purged environment.
The 274 TECMount requires water cooling for proper operation. For maximum
performance, a chiller rated for at least 400 Watts or greater is recommended,
but smaller chillers can be used for lower power applications. In most
applications, the 5300-10-18 TECSource temperature controller is a good
match for the mount, but for maximum performance, a 5400-15-28 TECSource
temperature controller is required.
The 274 TECMount also offers all the features you would expect from a modern
diode fixture, including:
 Hard nickel over copper thermal plate.
 Designed to be quickly integrated with Arroyo’s TECSource
instruments.
 Industry-standard D-sub connector and pin-outs allow for quick
integration into existing laser applications.
 External sensor input for easy injection of on-board device sensor as
sensor feedback.
Installation and Use
Connecting to the TEC Controller:
First, connect the 274 TECMount to your temperature controller. Make sure the
temperature controller’s current limit is set to a maximum value of no more than
16 Amps. Where possible, we recommend the use of Arroyo Instruments TEC
cables. If you are using an Arroyo Instruments 5300 Series TECSource
temperature controller, as 1262B TECSource cable is the recommend
interconnect between the mount and controller. For the 5400 Series controllers,
use the 1264-DB15 cable.

Page 4 · 274 TECMount User’s Manual
NOTE
Arroyo Instruments offers TEC cables designed to connect directly
between our TECSource products. If you use your own cables, ensure
the connections are properly made between the instrument and the
mount, and that proper grounding techniques are used. The pin-out of
the connectors can be found later in this document.
Connecting the water supply:
The 274 comes with factory installed brass barbs suitable for 3/8” I.D. hose, but
they can be replaced with any 1/8” NPT male fitting. It is recommended that
when using the barbs, pipe clamps be used to secure the hose to the 274.
NOTE
Earth Grounding Considerations
If your application requires that the cold plate be earth grounded, you
should directly wire the cold plate to earth ground.
When not using the 274 for prolonged periods of time, it is recommended that
the water be drained from the unit and allowed to air dry. A burst of compressed
air is also beneficial to blow out any residual water inside the unit.
Mounting Plate
The 274 TECMount has a bread board configuration with M3 holes on 10mm
centers. Optional blank adapter plates are available in several sizes (3.2”, 4.2”,
and 5.2” square) to allow for custom mounting patterns or larger mounting
surfaces. See mechanical information below.

274 TECMount User’s Manual · Page 5
Connector Pin-Outs
DB-15 Pin Description
1, 2 & 9 TE (+)
3, 4 & 10 TE (–)
7 & 14 Thermistor or RTD / Sensor+
8 & 15 Thermistor or RTD / Sensor–
11, 12 & 13 FAN (+)
DB-15 Connector Pin-Out
Phoenix Pin Description
1 EXT (+)
2 EXT (–)
Phoenix 2-Pin Connector Pin-Out
Sensor Polarity and 4-Wire Connections
While the thermistor and RTD inputs are not polarized, when using a 4-wire RTD
connection from the mount, it is important to properly connect the polarity of the
sense wires to the sensor. Pins 7 and 14 should be one polarity (+) and pins 8
and 15 should be the opposite polarity (–). If polarities are not matched, the
instrument will indicate a sensor error.
EXT Input and SENSOR Switch
The 274 features a SENSOR switch to quickly switch between internal and
external temperature sensors. With the SENSOR switch in the INT position, the
internal thermistor embedded in the cold plate is used to provide the feedback
for the temperature controller. With the SENSOR switch in the EXT position, the
EXT+ and EXT- inputs on the Phoenix connector are connected to pins 7 & 14
Sensor+) and 8 & 15 (Sensor–).
The 274 comes with one Phoenix 2-pin plug. Additional plugs can be ordered
online at www.mouser.com or www.digikey.com, Phoenix part number 1803578.

Page 6 · 274 TECMount User’s Manual
Technical Specifications
274 TECMount
COLD PLATE
Mounting Holes M3
TEMPERATURE CONTROL
Standard Model (+85°C)
Temperature Range (°C) -25 to +85, non-condensing
Sensor Type 10kΩThermistor
High Temp Model (+150°C)
Temperature Range (°C) -25 to +150, non-condensing
Sensor Type 100ΩPlatinum RTD
TE Module (at 25°C)1Imax = 16A
Vmax = 33V
CONNECTORS / INTERFACES
Temperature Controller DB-15, male
External Sensor Phoenix 2-Pin (plug p/n 1803578)
Coolant Inlet/Outlet 1/8” Female NPT with pre-installed
brass hose barbs (3/8” I.D. hose)
GENERAL
Recommended Coolant Distilled Water
Max Water Pressure (psi) 80
Max Housing Temperature (°C) 60
Size (H x W x D) [in(mm)] 2.5 (63.5) x 4.8 (121.9) x 3.2 (81.3)
Wetted Materials
For purposes of evaluating galvanic corrosion, the following materials will make
contact with the coolant:
 Housing: Anodized AL 6061-T6
 Dissipative plate: Electroless nickel plated AL 6061-T6
 Fittings: UNS C36000 Brass
 O-ring: EPDM
1See Operating at High Temperatures, below, for additional requirements at high temperatures

274 TECMount User’s Manual · Page 7
Thermal Performance Graph
* Graph represents typical performance, and will vary by flow rate and other conditions.
0
20 40 60 80
100 120 140 160 180 200 220 240 260
0 20 40 60 80 100 120 140 160 180 200 220 240
DeviceThermalLoad(Watts)
TECPower(Watts)
274TECMountPerformanceCurves
20⁰CWaterTemperature

Page 8 · 274 TECMount User’s Manual
Pressure Drop vs Flow Graph
* Graph represents typical performance, and will vary by flow rate and other conditions.
0.0
2.0
4.0
6.0
8.0
10.0
12.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
PressureDrop(psi)
VolumeFlowRate(gpm)
274TECMountPressureDrop
20⁰CWater

274 TECMount User’s Manual · Page 9
Configuring the Temperature Controller
When using an Arroyo Instruments temperature controller, the easiest method
for configuring the controller to operate with the mount is to change the Mount
setting in the menu by selecting the 274 or 274-150, depending This will
change the sensor settings and current limit to be appropriate for this mount.
If you will be using a non-Arroyo controller, make sure to adjust the limits and
sensor settings appropriately to ensure proper and safe operation of the mount.
Using the Thermistor on Standard Versions
The 274 LaserMount is equipped with a 10kΩ negative temperature coefficient
(NTC) thermistor, specifically, the BetaTHERM 10K3A1. A thermistor works by
translating temperature into resistance, with resistance decreasing as
temperature increases (hence the ‘negative coefficient’).
Below is the response curve of the thermistor:
Resistance vs. Temperature Graph
As can be seen by the graph, the resistance of the thermistor drops very quickly.
In the typical control range (0°C to 40°C), typical 10K thermistors offer good
sensitivity to changes in temperature, and this is the range in which most 10K
0
10000
20000
30000
40000
50000
-10.00 10.00 30.00 50.00 70.00 90.00 110.00
Resistance (Ω)
Temperature (°C)

Page 10 · 274 TECMount User’s Manual
thermistors are typically used. 10K thermistors can be used at much higher
temperatures, but will suffer poorer temperature stability performance because
of the lower sensitivity.
All Arroyo temperature controllers support operation using a 10μA or 100μA
thermistor bias, which limits the upper control range to 450kΩ or 45kΩ,
respectively. To minimize noise and maximize stability, you should select
highest current while still allowing you full operation across your required
temperature range. The typical setting is 100μA, but your application will
determine the actual needs.
The Steinhart-Hart Equation
As can be seen from the temperature versus resistance graph above, resistance
varies inversely with temperature in a non-linear fashion. This relationship can be
accurately modeled by polynomial equations, and one such being the Steinhart-
Hart equation:
3
)ln(*)ln(*
1RCRBA
T

The coefficients for the BetaTHERM 10K3A1 thermistor are:
A = 1.12924x10-3
B = 2.34108x10-4
C = 0.87755x10-7
These are the default coefficients for Arroyo Instruments temperature controllers,
but can be changed in the Sensor menu, or by selecting the appropriate 274
mount from the Mount menu setting.