Sauermann Si-TH4 Wireless Thermo-hygrometer (Psychrometer)
- Flexible probe with sliding magnet for easy positioning
- Fast and accurate calculations of Dry Bulb and Wet Bulb temperatures
- Compatible with A1 / A2L / A2 / A3 refrigerants
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Find out more on our delivery information page.
We want our customers to be fully satisfied with the goods they purchase from us, offering returns for up to 60 days.
Find out more about our refunds policy here.
We're always happy to offer help, information & advice to find the right instrument for you, so please get in touch.
To speak to our sales team, call us on 0113 248 9966, use our Live Chat service or contact us online.
Use reward points to get money off future purchases.
Please note: Customers must be signed into their account to be elegible. Find out more about reward points here.
Found this product cheaper & in stock somewhere else? Give us the details and we'll endeavour to match the price.
To price match, contact us online or call 0113 248 9966.
We offer FREE standard delivery on all orders over £249, with a range of next-day options also available on many items.
Find out more on our delivery information page.
We want our customers to be fully satisfied with the goods they purchase from us, offering returns for up to 60 days.
Find out more about our refunds policy here.
We're always happy to offer help, information & advice to find the right instrument for you, so please get in touch.
To speak to our sales team, call us on 0113 248 9966, use our Live Chat service or contact us online.
Sauermann Si-TH4 Wireless Thermo-hygrometer (Psychrometer)
The Sauermann Si-TH4 Wireless Thermo-hygrometer (Psychrometer) is a psychrometric probe that is designed to provide accurate indoor and outdoor measurements of temperature (-20°C to 60°C) and humidity (0% to 100% RH). It is made to use in air conditioning, refrigeration, and heat pump installations, allowing fast and easy calculation of dry bulb and wet bulb temperatures.
The Si-TH4 features a flexible probe with a sliding magnet, which makes it convenient to place it in ducts, units and other measurement points. It automatically connects to the Si-RM350 and Si-RM450 manifolds, as well as to the Sauermann Pilot App at a wireless distance of 100 m (328 ft), providing technicians with immediate access to real-time data for diagnostics and system optimisation.
The Si-TH4 is compatible with A1, A2L, A2, and A3 refrigerants and with certain B1 refrigerants. However, it must not be used with ammoniac refrigerant NH₃ / R717. Powered by three LR03 AAA 1.5 V alkaline batteries, the Si-TH4 offers an impressive 50 hours of continuous battery life for continuous use in the field.
Part number: 28145
Comparing Sauermann Si-RT2, Si-RT5, Si-RT7 and Si-TH4
| Specifications | Si-RT2 | Si-RT5 | Si-RT7 | Si-TH4 |
|---|---|---|---|---|
| Sensor type | NTC | NTC | NTC | CMOS (Temp + Humidity) |
| Available units | °C, °F | °C, °F | °C, °F | °C, °F |
| Resolution | 0.1 °C / 0.1 °F | 0.1 °C / 0.1 °F | 0.1 °C / 0.1 °F | 0.1 °C / 0.1 °F 0.1% RH |
| Temperature range | -50 to 120 °C (-58 to 248 °F) | -20 to 85 °C (-4 to 185 °F) | -20 to 85 °C (-4 to 185 °F) | -20 to 60 °C (-4 to 140 °F) |
| Temperature accuracy | ±1 °C (from -20 to 85 °C) | -20 to 70 °C: ±0.3 °C 70 to 85 °C: ±0.5 °C |
±1 °C | -20 to 0 °C: ±0.3 °C 0 to 60 °C: ±0.5 °C |
| Humidity range | - | - | - | 0–100 %RH |
| Humidity accuracy | - | - | - | ±2 %RH (10–90 %RH) ±5 %RH (0–10 %RH / 90–100 %RH) |
| Max Operating Temp | Jaws: 150 °C, Handle: 90 °C | - | Jaws: 85 °C, Handle: 50 °C | - |
| Power Supply | Via manifold (wired) | Via manifold (wired) | 3 × AAA batteries | 3 × AAA batteries |
| Battery Life | - | - | 150 h @ 20 °C | 50 h @ 20 °C |
| Wireless Frequency | - | - | 2402–2480 MHz, 8 dBm | 2402–2480 MHz, 8 dBm |
| Wireless Range | - | - | Up to 100 m (manifold or smartphone BLE 5.0) | Up to 100 m (manifold or smartphone BLE 5.0) |
| Storage Temp | -20 to 50 °C | -20 to 50 °C | -20 to 50 °C | -20 to 50 °C |
| Compatibility | Si-RM350 & Si-RM450 manifolds | Si-RM350 & Si-RM450 manifolds | Si-RM350, Si-RM450, Sauermann Pilot app | Si-RM350, Si-RM450, Sauermann Pilot app |
| Mounting Method | Parrot-shaped clamp | Hook-and-loop strap | Parrot-shaped clamp | Flexible probe with sliding magnet |
| Pipe Diameter | 6–42 mm (0.2’’–1.7’’) | Up to 100 mm (3.9’’) | 6–42 mm (0.2’’–1.7’’) | - |
| Cable | 2 m PVC, Ø3.2 mm, max 105 °C | 2 m PVC, Ø3.2 mm, max 105 °C | Wireless (no cable) | Wireless (no cable) |
Key Features
- A1 / A2L / A2 / A3 refrigerants compatible
- For use with Si-RM350/Si-RM450 Digital Manifolds
- Fast and accurate Dry Bulb and Wet Bulb temperatures
- Outdoor, indoor and in-ducts measurements
- Flexible probe with sliding magnet for easy positioning
- Quick & Strong wireless auto connection (100 m/328 ft range)
- Real-time readings through direct connection to Sauermann Pilot mobile app
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Units
Instrument Dimensions
Measuring ranges
Technical details
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Sauermann Si-RM450 4-way Digital Refrigeration Manifold SKU: SAUESIRM450£369.00 (ex VAT)£442.80 (inc VAT) -
Sauermann Si-RM350 2-Way Digital Refrigeration Manifold SKU: SAUESIRM350£334.00 (ex VAT)£400.80 (inc VAT)