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Explore how to choose temperature sensing components. Compare thermistors, RTDs, ICs, specs, standards, and selection tips with South African availability from Communica.
Understand thermistors, RTDs, thermocouples, and digital ICs for various project needs.
Find top brands and practical buying tips for SA industry and education users.
Step-by-step guidance for specs, wiring, and common errors in temperature measurement.
Whether you're building a weather station in Johannesburg, monitoring a cold chain in Cape Town, or prototyping a smart home device in Durban, selecting an appropriate temperature sensor is crucial for accuracy, reliability, and long-term project success. With options ranging from thermistors to advanced digital ICs, understanding their characteristics is essential for both students and professionals.
Tip: In South Africa's varied climates and industrial settings, choose sensors rated for the relevant ambient conditions and review local stock for maintenance or scale-up requirements.
| Sensor Type | Typical Range | Accuracy | Application Notes |
|---|---|---|---|
| NTC/PTC Thermistor | -55 degreesC to +150 degreesC | 0.2-2 degreesC | Cost-effective, rapid response; calibration recommended. |
| RTD (Pt100/Pt1000) | -200 degreesC to +850 degreesC | 0.1-0.5 degreesC | High precision; suited for lab and industrial control. |
| Thermocouple (Type K, J, etc.) | -200 degreesC to +1350 degreesC | 0.5-2 degreesC | Wide range; simple signals, needs amplification/compensation. |
| Semiconductor (IC-based) | -40 degreesC to +125 degreesC | 0.25-2 degreesC | Direct digital output; easy microcontroller integration (e.g. LM35, DS18B20). |
Communica stocks global brands such as Amphenol, TE Connectivity, Texas Instruments, Maxim Integrated, and Adafruit, enabling local projects to access a broad range of sensor standards and footprints.
For student labs and rapid prototyping, choose easy-to-wire digital sensors compatible with Arduino/Raspberry Pi, such as DS18B20 (1-Wire) or TMP36 (analog), available in multiple package types from Communica. Industrial deployments may require higher accuracy, robust housings, and longer cable runs - in these cases, RTD or thermocouple options are preferred.
Consideration: Check real-time stock and branch collection options at Communica, particularly for Pt100 elements or specialty thermistor part numbers. Lead times for bulk/industrial sensor orders can be 5-15 working days in South Africa.
| Parameter | Thermistor (NTC) | RTD (Pt100) | DS18B20 (Digital IC) |
|---|---|---|---|
| Max Temperature | 125 degreesC | 500 degreesC | 125 degreesC |
| Typical Accuracy | 1 degreesC | 0.2 degreesC | 0.5 degreesC |
| Output Signal | Resistance | Resistance | Digital (1-Wire) |
| Wiring | 2 wire | 2/3/4 wire | 3 wire |
To convert an NTC thermistor measurement into a usable temperature, you typically use a voltage divider and the Steinhart-Hart equation or simplified Beta parameter calculation:
1/T = 1/T + (1/beta) x ln(R/R) Where: T = absolute temperature in Kelvin T = reference temperature (usually 25 degreesC/298.15 K) beta = Beta constant (from datasheet) R = measured resistance R = resistance at reference temperature
Example: If your NTC thermistor is rated at 10kOhm at 25 degreesC with beta = 3950, and you measure 6.5kOhm, you can estimate the temperature using the formula. Many microcontroller libraries can perform these conversions automatically.
+3.3V
|
[10kOhm NTC]
|
+------ ADC IN (to microcontroller)
|
[10kOhm fixed resistor]
|
GND
For an RTD or thermocouple, consult the datasheet for correct bridge or amplifier wiring; incorrect connections result in non-linear readings or electrical noise.
Callout: Always match extension cables to sensor type (e.g. thermocouple extension wire); mixing connectors introduces error.
In South African tertiary labs, popular faults include uncalibrated analog inputs, using incorrect cable types for thermocouples, or running sensors at ambient limits in hot mechanical workshops. Always test with a calibrated reference or use a multimeter for initial verification.
Brands commonly in local stock include Adafruit (for dev kits), Amphenol and TE Connectivity (industrial probes), and Texas Instruments or Maxim (precision ICs). Check lead time for less common packages or for sealed probes in food/lab contexts (may be 7-20 days).
Free shipping for orders over ZAR 1,000.00.
Get a full refund if you had the product for less than 7 days.
Nationwide delivery within 2 - 4 working days.
Very friendly and helpful; and a wide selection of items (at their location). You can also purchase via their WebSite; I have never been disappointed...
Review for Communica Samrand Security Wanted to share a heartfelt thank you to the security team at Communica Samrand! Yesterday, I had a personal ex...
Quick service from Layla and her team in providing technical assistance and getting my order together. This is the best service I have received in a l...
I love this place and have been purchasing my electronic parts over 25 years . Layla has been a super sales lady ..friendly and knows her products .
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Visited a couple of times for supplies and specialised parts Staff is extremely friendly and always helpfull
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Awesome service from Sydney and Nicole...keep up the great job guys
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What an absolute gem Layla is! She went out of her way to source my requested items from another branch, without me asking, and done so with a great b...
I was assisted by Fatima. She was friendly, patient and professional. Thanks for the great service!
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Verified customerI had a fantastic experience at Communica, thanks to the exceptional service provided by Rehaan in sales and Nicole at the cashier. Rehaan was incredi...
Got assisted by a very patient and diligent gentleman by the name Sydney. He was patient in getting me what I needed from the little information I gav...
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Can i give Fatima her flowers.... 10 000 out of 100. Customer service-100% Patience-100% Product knowledge-100% Had the best shopping experience there...
Leila was very helpful and super nice!
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Fatima was very helpful and patient with my many queries. The shop itself has seen better days but the service was great.
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Great experience with every purchase thanks to Sydney and nicole
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Ordered online, was just after 6am. Asked if I can pick items up as I wanted to install over the weekend and delivery stated 2-4 working days. Though...
Online support and communication is next level - great communication, fast response - very helpfull, recomended supplier - online payment was no hasse...
He's polite, good with people and made me feel free to talk.. all in all he's helpful
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Best service received from Rocket! What a pleasure dealing with him. Thank you Rocket
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Excellent service so far
Verified customerSydney offered exceptional service. He took me step by step on what I needed to buy. Thank you Nicole for the service
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Excellent service by Sydney at the ino counter. So many awsome products! Perfect place to buy gifts for tech junky friends.
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Leburu and nicole were both very helpful my boss send me to get few items as I wasn't very familiar with the items Leburu and my boss spoke with each ...
Sydney and Nicole were amazing I came in and finished within no time thank you so much keep up the friendly service
Verified customerCustomer service is excellent. Thank you to Mpho for helping me get what I need from the store
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Verified customerThe service I always get from Sydney And Lacy the Cashier is amazing. Those are my guys...keep up the good works gentlemen.
Verified customerOrdered online. Got my order in less than 24 hrs. I was updated all the time on the progress. I have never seen service like this. Thanks and well don...
Sydney and Nicole were absolutely fantastic and helped me with my purchases. Thank you.
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Needed to buy a bluetooth GPS receiver. The staff was friendly, knowledgeable and assisted without any issues. This is a toys tore of note for peopl...
azul and Nicole were very helpful and very efficient
Verified customerCynthia at the counter is always very helpful, in fact, all the counter sales ladies are very helpful. Can't say the same for the staff when calling ...
They have mostly any electronic tool and components that you may require - Thanks to Nicole for helping me.
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One of the cashier services rendered to me was here at communica by the lady named Nicole and her manager dolly they were both willing to go above and...
The service was excellent, Nicole and Rehaan were very helpful and professional in their work.
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Great service, Rehaan and Layla were spectacular with assistance. 10/10 Would definitely recommend.
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Mohamed Sharief is a great asset to Communica. He provides a 5 star service and good product knowledge. Keep up the good work.
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I received a great service from Rehaan, Windy and Nocole. Excellent customer service.
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Quick quality customer service.
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Very good service and a happy welcoming smile from the cashier Nicole
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Verified customerFatima & Nicole delivered an excellent customer service
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Verified customerMpho helped us quickly and with knowledge Excellent
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Verified customerPatient and kind
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Verified customerCHAT RESPONSE TIME DEFINITELY WAY ABOVE GENERAL AVERAGE, WELL DONE.
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Verified customerEXCELLENT SERVICE FRONT JACQUELINE AND Windie
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Verified customerMy electronics go to place
Verified customerGreat service
Verified customerSydney en Lacy was baie hulpvaardig. Goeie diens!
Verified customerNicolene
Verified customerGreat place to purchase electronic components at a fair price. They have a wide range of products and a well functioning ticketing system that ensures...
After being supplied the incorrect track for my garage motor, despite me asking twice if it was the correct track, I had to return to the store to exc...
They have most every electronics component you might need. Staff are knowledgeable and friendly. I was looking for a bespoke miniature item for a lapt...
Great service as always from Nicole and Sydney especially Mpho at the sales desk
Verified customerGood Array of products and sound advice
Verified customerGreat inventory. Very slow service, though the staff seem to do their best. Single till open mostly with overbearing security measures. Can do with so...
I visit Communica once in a blue moon. Always wish i have more time to look at everything. Good & friendly service. Nothing wrong with a queuing syste...
Currently have only purchased items from their on-line store. Received what I ordered plus quick delivery. No complaints to date.
Verified customerThe new ticketing system is great, but the queues are still exceedingly long, and there are hardly any staff on hand in the shop to assist with questi...
I needed a heat-sensitive diode as one of my Philips appliances had had a failure. Philips wants you to throw the entire thing away, but I tried look...
I got the most pleasant service from Sydney and Windie
Verified customerExcellent range of items, with technical staff that know their stuff. Unfortunate location that makes it a bit difficult to get to, but worth the tre...
Wide range of electronic components. Very likely to find what you are looking for. Arthur was very helpful. Don't bother trying to call for informatio...
Great place. Reasonable prices. Keeps component level items as well as security, surveillance and electrical items and tools
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Great pricing and a wide variety of products to choose from. A must visit if you've ever been to the Pretoria branch.
Verified customerNicole was very helpfull and friendly.
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Verified customerGood service, would recommend.
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Verified customerService has improved but still a long way to go to actually sort it out.
Verified customerFriendly service and a vast range of electronic components, devices etc.
Verified customerThe is a computerised quing system and you can pick n pay....but the problem is the is no lift and the only way to get up is using steps
Verified customerFor Sonoff ewelink WiFi switch.
Verified customerThank you for your patience ma'am Mpho
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Verified customerNicole and Sydney were very helpful
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Verified customerA good electrical/electronic sales store packed with almost every component you require
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Verified customerExcellent, ask for Sydney. Solved immediately
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Verified customerBig electronic component shop. Counter can be very busy. Lots of parking.
Verified customerClose to closing time so i was in and out quickly
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Verified customerExcellent service Nicole
Verified customerLarge selection, low on staff during lunch time when they are busy.
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Verified customerWhatever you need they have
Verified customerLarge number of electronic components
Verified customerCan spend hours in there
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Verified customerWaiting time can be annoing.
Verified customerCommunica supplies semiconductors and electronic components to industries such as automotive, electrical, automation, mining, and education.
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