CMA ML45m User guide

Brand: CMA

Model: ML45m

Type: User guide

TEMPERATURE(SENSOR (ML45M (

USER’S&GUIDE&

(

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&not&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.&&

(

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.&

Figure&1.&Measuring&the&temperature&of&a&can d le&flam e.&&

4(|(ML45m&Temperature&Sensor&User’s&Guide&&

Technical(Specifications( (

(

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&not&apply&if&

the&sensor&has&been&damaged&by&accident&or&misuse.&&

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

CMA ML45m User guide

CMA ML45m User guide

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