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Discover thermistors, RTDs, and digital sensors for HVAC systems. Compare types, learn selection tips, wiring, and source components locally at Communica.
Thermistors, RTDs, and semiconductors for accurate HVAC measurements.
Choose the right sensor with compatibility, placement, and wiring in mind.
Find leading sensor brands stocked in South Africa at Communica branches.
Heating, ventilation, and air conditioning (HVAC) systems in South African homes, schools, and commercial buildings rely on precise temperature sensing to maintain comfort and efficiency. The correct temperature sensor-whether for room feedback, duct control, or compressor safety-ensures accurate readings, minimal downtime, and optimised energy use. This guide covers the key sensor types, how they work, and what to look for when specifying or replacing them in SA environments.
| Sensor Type | Typical Range ( degreesC) | Accuracy | Response Time | Use Case |
|---|---|---|---|---|
| NTC Thermistor | -40 to +125 | 0.2-1 degreesC | Fast | Room/air/pipe sensing |
| RTD (Pt100/Pt1000) | -50 to +400 | 0.1-0.3 degreesC | Medium | Chillers, critical HVAC |
| Semiconductor | -40 to +150 | 0.5-2 degreesC | Fast | IoT, building automation |
Commonly stocked brands at Communica include EPCOS, TE Connectivity, Amphenol, and Texas Instruments for both discrete sensors and ready-made probes or digital modules. Inquire about same-day pickup for urgent repairs or lab use, or explore the Sensors and Shop by Brand ranges online.
Selecting a temperature sensor goes beyond choosing a part number. Consideration of sensor behaviour, environment, accuracy needs, and system compatibility is critical for reliable HVAC control, whether specifying for a new build, automation retrofit, or maintenance in a local facility.
Below is a sample wiring diagram for a 2-wire NTC sensor connected to a basic room thermostat or building management system (BMS):
HVAC Controller NTC Sensor
(Signal/Common)
Always confirm polarity and wiring conventions using your controller's datasheet. Poor contact, long wires, or mismatched sensor types are common troubleshooting points in field repairs.
Assume a 10kOhm NTC thermistor is used in a return air sensor for an office HVAC system in Johannesburg, with a typical room temperature of 25 degreesC. Using the sensor's datasheet (e.g., EPCOS B57560 series), expected resistance at 25 degreesC is about 10kOhm. At 35 degreesC (hot summer day):
This non-linear behaviour is key for controller calibration. RTDs, by comparison, have a nearly linear output for simpler integration where higher accuracy is required.
Always check datasheets, test resistance at ambient temperature, and verify that new sensors are compatible with the BMS/HVAC controller model installed on site.
Communica stocks a wide range of temperature sensors, including NTC/PTC thermistors, RTDs, and digital/semiconductor modules from brands like EPCOS, Amphenol, Texas Instruments, and TE Connectivity. Local branches enable fast pickup or collection. Browse the Sensors category or use the Shop by Brand page to find compatible parts for immediate or planned repairs, educational use, or system upgrades.
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.
Communica supplies semiconductors and electronic components to industries such as automotive, electrical, automation, mining, and education.
Disclaimer: This content is for educational purposes only. Product availability, pricing, and specifications are subject to change. Always verify current details on the retailer's website before making a purchase. We may earn affiliate commissions from qualifying purchases.
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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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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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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
Verified customerAt the till we met Nicole, First of her name! The rightful heir to the iron throne! the Unburnt, Breaker of Chains and pillar of strength at Communic...
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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
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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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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
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They have mostly any electronic tool and components that you may require - Thanks to Nicole for helping me.
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The service was excellent, Nicole and Rehaan were very helpful and professional in their work.
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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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Quick quality customer service.
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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...
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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 customerAll the goodies in one place and Mohamed is always willing to help
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