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Step-by-step South Africa-focused guide to selecting, wiring and mounting vehicle thermal sensors (thermistors, DS18B20, K-type). Includes diagrams, formulas and local sourcing tips.
Match range, form factor and interface to the vehicle location and use case.
Use proper probes, shielding and thermal contact to ensure reliable readings.
Check stock, branch pickup and VAT invoicing to minimise downtime in South Africa.
Installing thermal sensors in your vehicle lets you monitor engine, coolant, oil, transmission and ambient temperatures in real time. Makers, students and technicians use sensors for preventative diagnostics, logging during track days, and automated cooling or fan control. This guide covers common sensor types, selection criteria, wiring basics and South African considerations such as local stock, lead times and branch collection.
Pick a sensor type based on temperature range, accuracy and installation location. Typical choices include:
| Sensor | Range | Accuracy | Notes |
|---|---|---|---|
| NTC Thermistor | -40°C to 150°C | ±0.5-2°C | Cheap, needs lookup table/calibration |
| DS18B20 (digital) | -55°C to 125°C | ±0.5°C (typ) | 1-wire bus, waterproof probes available |
| K-type Thermocouple | -200°C to 1372°C | ±1-2°C (with amplifier) | Requires amplifier/ADC and compensation |
Availability note: Communica stocks sensors and maker modules across categories. Check component ranges via the Collections page for categories and product types before planning an installation (Browse collections).
Analogue NTC thermistors typically form part of a voltage divider. Use Ohm’s law and the divider formula to calculate expected voltages for your ADC.
If Rth is the thermistor and Rfixed is the reference resistor tied to Vcc, the measured voltage Vout is:
Vout = Vcc * (Rfixed / (Rfixed + Rth))
Choose Rfixed close to the thermistor resistance at the mid-point of your expected temperature range for best ADC resolution. For example, for a 10k NTC with expected 0-100°C span, use a 10k reference.
Thermocouples produce millivolt-level signals and need a cold-junction compensation amplifier (e.g., MAX31855). The amplifier outputs SPI or digital readings suited to microcontrollers like Arduino or Raspberry Pi. Communica’s product range includes amplifier modules and compatible brands; check Shop by Brand for options (Shop brands).
Microcontroller ----+---- 4.7k ----+---- Vcc (3.3V or 5V)
| |
Data pin DS18B20
| |
GND ---------- GND
The DS18B20 uses a 1-wire bus; multiple sensors can share the same data line. Use waterproof probe variants for coolant or bulkhead installations.
For component sourcing and to view part specifications, see the All Products index (All Products).
Correct mechanical installation affects accuracy and longevity. Follow these practices:
Use a waterproof DS18B20 probe in a radiator hose adaptor or M10/M12 threaded bung. Connect to a microcontroller ADC or 1-wire bus, and log readings at 1-5 second intervals. Calibrate by comparing to a trusted workshop thermometer; software calibration offsets of ±1-2°C are common.
Attach a K-type thermocouple to the exhaust manifold using a high-temp clamp and connect to a MAX31855 amplifier. Readings should be sampled less frequently (every 2-10 seconds) to manage noise. Use twisted pair cabling and ensure amplifier ground reference matches the data logger.
Sourcing parts locally reduces downtime. Communica offers a broad range of sensors, amplifier modules and maker boards suitable for automotive projects. For quick collection or quoting, check branch availability and trading hours before ordering (Branches & Trading Hours). Large procurement for workshops or university labs can request account quotes and VAT invoices via the company About page guidance (About Communica).
Consider pairing sensors with:
To explore compatible parts and development hardware, browse Communica’s product index and category collections (buy-temperature-control-sensors / temperature-control-sensors-online).
Estimated costs in South Africa (ZAR): small sensor probes and modules typically range from R80 to R600 per item depending on type and brand; amplifier modules and high-temperature probes are higher. These are approximate ranges and subject to stock and lead times. For exact availability and VAT invoices for institutional purchases, consult Communica’s purchasing channels.
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...
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Excellent service so far
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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...
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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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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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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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Very good service and a happy welcoming smile from the cashier Nicole
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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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Verified customerNicole was very helpfull and friendly.
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Verified customerService has improved but still a long way to go to actually sort it out.
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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
Verified customerIf you love engineering you'll love this shop apart from the terrible queues and long waiting times
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Verified customerVery fast and friendly service, avoid it in friday afternoon if possible.
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
Verified customerAll the goodies in one place and Mohamed is always willing to help
Verified customerWide variety of electronic goods. Staff helpful with good advise.
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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 customerDefinitely will have what you're looking for.
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Verified customergood selection of electronic supplies accessible
Verified customerGreat variety of stock on hand
Verified customerGood variety of electronic components available
Verified customerWide variety of electronic supplies available here
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Verified customerBig variety and good prices
Verified customerAll your electronics requirements under one roof, and more!
Verified customerThe place to go whatever your electrical and electronics needs.
Verified customerExcellent range of electronic products
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Verified customerLove everything here...
Verified customerGood range of products
Verified customerWhatever you need they have
Verified customerLarge number of electronic components
Verified customerCan spend hours in there
Verified customerRather a slow process
Verified customerExcellent merchandising
Verified customerGood products
Verified customerHelpful and efficient
Verified customerPlace if definite interest
Verified customerGet electronic kits
Verified customerWide range of components
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Verified customerElectronic components wholesaler
Verified customerloads of electronic components
Verified customerelectronics sales warehouse
Verified customerCool
Verified customerhuge selection
Verified customerCool electronics
Verified customerFascinating
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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