The SUTO S305 Dew Point Monitor offers a simple and inexpensive dew point monitoring solution, with alarm options. The all-in-one solution serves as a dew point measuring and display device for desiccant and fridge dryers.
Made in Germany. brand SUTO, model S305
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The SUTO S305 Dew Point Monitor is a simple and inexpensive all‑in‑one solution for dew point measurement and display, designed for desiccant and refrigerant dryers. It features an optical red backlight that blinks when an alarm is triggered, plus two alarm relays that can connect to external lights and sirens, with two programmable alarm levels (pre‑alarm and main alarm).
The monitor is available in two measurement ranges: Option 1 from –60 °C Td to +20 °C Td, and Option 2 from –20 °C Td to +50 °C Td. Connection to the compressed air network is via a 6 mm quick‑connector and corresponding hose, and a 4…20 mA output allows integration with a PLC or SCADA system.
The entire measuring unit, including a reliable polymer dew point sensor with an integrated measuring chamber for accurate readings and fast response, is housed together with the display in a rugged IP65‑rated enclosure, available as a panel or wall‑mounted variant. Installation is plug‑and‑play—no complicated setup required.
An optional alarm unit offers a wall‑mounted housing with a large display for dew point, temperature, and humidity, featuring a 360° visible LED and buzzer for reliable alarm indication; it can be mounted on the wall or directly on the main housing.
The S305 provides advanced monitoring with programmable pre‑alarm and main alarm for increased sensitivity, and customizable alarm notifications via visual indicators or separate relay outputs for seamless integration into wider alarm systems.
Refrigeration dryers are the most commonly used dryers in compressed air systems worldwide; if the required drying is not achieved, wet air can cause rust in pipes, machine breakdowns, and negative impacts on product quality. The S305 addresses this by giving an alarm whenever drying values fall outside the desired range.
Additionally, SUTO’s exchange calibration service eliminates downtime and enables users to maintain a seamless record of their dew point measurements.
Benefits
Application
Features
| MEASUREMENT | |
| Dew Point | |
| Accuracy | ±2 °C Td |
| Selectable units | °C, °F |
| Measuring range (model depending) | -60 … +20 °C Td -20 … +50 °C Td |
| Sensor | Polymer |
| Response time t90 (@ 4l/min) | -60 °C Td -> -20 °C Td = 20 sec 0 °C Td -> -40 °C Td = 120 sec |
| Temperature | |
| Accuracy | 0.3 °C |
| Measuring range | -30 … +70 °C |
| Sensor | NTC |
| Reference conditions | |
| Selectable conditions | Pressure Dew Point |
| SIGNAL INTERFACE & SUPPLY | |
| Analog output | |
| Signal | 4 … 20 mA 3-Wire |
| Scaling | -60 … +20 °C Td or -20 … +50 °C Td |
| Load | 250R |
| Update rate | 3 / sec |
| Supply | |
| Voltage supply (model depending) | 100 … 240 VAC ; 50/60 Hz 24 VDC |
| Current consumption (model depending) | 40 mA @ 220 VAC 120 mA @ 24 VDC |
| GENERAL DATA | |
| Configuration | |
| PC Software | S4C-Display Software |
| Others | Instrument comes pre-configured Plug & Play |
| Display | |
| Integrated | LCD Display, indicates values and alarms |
| Material | |
| Process connection | Stainless steel 1.4301 (SUS 304) |
| Housing | ABS, Aluminium alloy |
| Sensor | Polymer |
| Metal parts | Sinter Filter (stainless steel) |
| Miscellaneous | |
| Electrical connection | Screw terminals |
| Protection class | IP65 |
| Approvals | CE |
| Process connection | 6 mm quick connector |
| Weight | 520 g |
| Operating conditions | |
| Medium | Non-corrosive gases |
| Medium quality | ISO 8573-1: 4.6.3 or better |
| Medium temperature | -30 … +70 °C |
| Medium humidity | ≤ 20 °C Td or ≤ 50 °C Td (model depending) |
| Operating pressure | 0.3 … 1.5 MPa |
| Ambient temperature | -10 … +40 °C |
| Ambient humidity | 0 … 100 % rH |
| Storage temperature | 0 … +40 °C |
| Transport temperature | -30 … +70 °C |
Stated accuracy under following conditions:
| Model | Description | Availability | Price | Qty | Buy |
|---|---|---|---|---|---|
| D699 3050 | S305 Dew Point Monitor (-20 … +50 °C Td), 6 mm quick connector, 1.5 MPa, 4 … 20 mA output, 100 … 240 VAC, 2 relay outputs | Delivery time from 12 weeks | On request |
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| D699 3051 | S305 Dew Point Monitor (-20 … +50 °C Td), 6 mm quick connector, 1.5 MPa, 4 … 20 mA output, supply 24 VDC, 2 relay outputs | Delivery time from 12 weeks | On request |
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| D699 3052 | S305 Dew Point Monitor (-60 … +20 °C Td), 6 mm quick connector, 1.5 MPa, 4 … 20 mA output, 100 … 240 VAC, 2 relay outputs | Delivery time from 12 weeks | On request |
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| D699 3053 | S305 Dew Point Monitor (-60 … +20 °C Td), 6 mm quick connector, 1.5 MPa, 4 … 20 mA output, supply 24 VDC, 2 relay outputs | Delivery time from 12 weeks | On request |
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| C198 0002 | Sinter cap, stainless steel, 12 mm | Delivery time from 12 weeks | On request |
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| A554 0024 | S305: Alarm unit, 100 … 240VAC, red light and buzzer alarm, wall mountable (Using the relay outputs of S305 to trigger the alarm) | Delivery time from 12 weeks | On request |
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| A554 0025 | S305: Alarm unit, 100 … 240VAC, red light and buzzer alarm, mounted at S305 casing (unit is using the relay outputs of S305 to trigger the alarm) | Delivery time from 12 weeks | On request |
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| A553 0106 | Power cable with mains plug, 1.8 m | Delivery time from 12 weeks | On request |
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You can request the necessary certificates, documentation, instructions and user guide for SUTO S305 using the special form.
You can buy SUTO S305 in UAE at a price starting from По запросу $ in «Texair FZCO» by leaving a request on the website, by phone +441225535040 or by email rop@texairmeasure.ae. SUTO S305 price are subject to change depending on exchange rates. We deliver instruments by transport companies in United Arab Emirates, Kuwait, Qatar, Saudi Arabia, Saudi Arabia, Bahrain and other Middle Eastern countries.
See also: Dew point meters for compressed air
