TEMPERATURE(SENSOR (ML45M (
USER’S&GUIDE&
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CENTRE FOR MICROCOMPUTER APPLICATIONS
http://www.cma-science.nl
2(|(ML45m&Temperature&Sensor&User’s&Guide&&
Short(description(
The& Temperature& sensor& ML45m& measures& temperatures& in& the& calibrated& range&&&&&&&&&&
@225& ..& 1225& °C& (@373& ..& 2237& °F).& Th e& sensor& uses& a& thermocoup le& type& K.& The&
thermocouple& consists& of& Chromel (nickel@chromium& (+))& and& Alumel (nickel@
aluminium&(@))&wires&that&are&butt@welded&together&at&one&end&to&form &a&measurin g&
tip.&&
The&thermocouple&wire&is&double&insulated&with&gla ss& b raid& an d&the& thermocoup le&tip&
is& exposed.& The& wire& is& about& 65& cm& long.& For& long& measurements,& the& maximum&
temperature& is& lim ited & to& 870°C.& The& insulation& is& d am ag ed & when& working& above&
482°C,& but& this& does& not& normally& detrimentally& influen ce & the& operatio n& of& the&
thermocouple.& The& thermocouple& may&be& d am ag ed & if& it& is& used& in& the& presence& of&
sulphur,&or&under&reducing&conditions.&
The&Temperature&sensor&is&an&I2C&digital&sensor,&w h ich &gives&calibrated&values&of&the&
measured& quantity.& This& sensor& can& only& be& connected& to& special& interfaces& that&
support&I2C&digital&sensors&like&the&CMA&MoLab&interface.&The&senso r&cable&need ed&
to&connect&the&senso r&to&an&interface&is¬&supplied&with&the&sensor&(sensor&cables&
are&supplied&with&interfaces).&&
Sensor(specifications(
The& Temperature& sensor& ML45m& is& a& digital& sensor& that& converts& the& measured&
temperature& value& to& a& digital& value& via& 16@bit& analog@to@digital& conversion.& The&
resolution&of&the&sensor&is &typical& 0.0 2&°C.&The&maximal&sampling& rate&of&the& sensor&is&
15&Hz.&&
Collecting(data((
This& Temperature& sensor& works& only& with& specific& interfaces.& The& sensor& will& be&
automatically& detected& when& connected& to& an& such& interface.& F or& detailed&
information& about& me as ure m en ts& with& se ns o rs& consult& the& User& Manuals& of& the&
interface&and&the&Coach&6&software.&&
Calibration((
The& Temperature& sensor& is& supplied& with& a& fa ctory& calibration & in& °C.& The& Coach& 6&
program&allows&shifting&the&pre@defined&calibration&if&needed .&The&user&calibration&is&
stored&in&non@volatile&user&sensor&memory.&&
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ML45m&Temperature&Sensor&User’s&Guide& |&3&
Suggested(experiments((
The& wide& temperature& range& of& this& sensor& enables& it& to& be& used & in& a& variety& of&
experiments.&&
• Measurements& of& the& temperature& inside& a& Bunsen& burner& flame& or& a& candle&
flame.&&
• Experimentally&determine&the&melting&point&of&copper,&bismuth,&or&other&solids.&&
• Measuring&freezing&and&boiling&points.&
• Specific&heat&experiments.&
• Measurement& of& breath& frequency& via& temperature& difference& between& inhaled&
and&exhaled&breath.&&
• Measuring&rapid&temperature&change.&
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Figure&1.&Measuring&the&temperature&of&a&can d le&flam e.&&
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4(|(ML45m&Temperature&Sensor&User’s&Guide&&
Technical(Specifications( (
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Sensor'kind'
Digital:&on@sensor&analog&to&digital&conversion&&
(16@bits&resolution,&communication&via&I2C)&
Measuring'range''
@225&..&1225&°C&(@373&..&2237&°F).&
Resolution''
0.02&°C&
Accuracy''
Typical&±&1&%&of&full&range&&
Metal'wires''
Chromel (nickel@chromium&(+))&and&Alu mel (nickel@
aluminium&(@))&
Insulation'
Glass&braid&insulation&
Speed''
In&still&air:&16&s&as&for&a&63% &ch a ng e&t o w ard s&t h e&
temperature&of&the&enviro nm e nt&&
In&fast&moving&air:&1&s &as&a b ov e& &
In&liquid:&0.1&s&as&abo ve &
Respond'time'
90%&instantaneous&tem p eratu re&change:&&
18.4&s&in&still&water&at&75°C&
26.5&s&in&still&air&at&room&temperature&of&28&°C&
Maximum'temperature''
870&°C&for&a&long&continuous&measurement&&
The&insulation&is&damaged&when&working&above&482&°C.&&
Limitations'
Can&be&damaged&when&used&in&the&presence&of&sulphur&
or&under&reducing&conditions.&
Maximal'sampling'rate'
15&Hz&
Sensor'dimensions'
Housing:&&37x&18&x&16&mm&
The&length&of&the&thermocouple&wire:&67&cm&&
Connection'
5@pins&mini&jack&plug&
Warranty:((
The& Temperature& sensor& ML45m& is& warranted& to&be& free& from& defects& in&materials&
and&workmanship& for& a& p eriod& o f& 12& m onths&from&the&date&of&purchase& provided&that&
it& h as&been&used&un de r&normal&laboratory&co n ditio n s.&This&warranty&does¬&apply&if&
the&sensor&has&been&damaged&by&accident&or&misuse.&&
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Note:(This'product'is'to'be'used'for'educational'purposes'only.'It'is'not'appropriate'
for'industrial,'medical,'research,'or'commerc ial'app licatio ns.' '' ' ' '
Rev. 17/11/2011
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