HVAC Systems Sensor Solutions | DuoMy Industrial Sensors

DM-MR10 Miniature Rotary Actuator, 10 N·m

Sat, 31 Oct 2026 09:33:22 +0000

Overview

The DM-MR10 provides controlled rotation in a package small enough to mount directly on a valve stem or a shutter shaft. A brushless motor drives through a low-backlash planetary stage, and an absolute encoder reports position over RS485 without a homing cycle at power-up.

The absolute encoder is the practical difference in valve and damper applications: after a power loss the actuator knows where it is and moves to the commanded position without driving the mechanism against a stop. Torque is limited electronically, so a jammed valve stalls the actuator instead of damaging it.

Key features

10 N·m continuous torque, 25 N·m peak
0.05° repeatability with absolute encoder feedback
RS485 Modbus control, optional 0-10 V or 4-20 mA
Electronic torque limiting and stall detection
Manual override hex on the output shaft
IP65 housing, -10 to +60 °C operating range

Typical applications

Quarter-turn valve and damper actuation
Optical shutter and filter wheel indexing
Rotary indexing tables in assembly machines
Adjustable orifice and louvre control

Sizing note

Size on the running torque plus a 50% margin for breakaway and fouling, not on the nameplate torque alone. A valve that has not moved for six months needs more torque to break away than the datasheet friction figure suggests.

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DM-LU200 Ultrasonic Level Sensor, 0.3-6 m

Sat, 31 Oct 2026 09:33:17 +0000

Overview

The DM-LU200 is the cost-effective answer for clean water level measurement in sumps, tanks and reservoirs. It fires an acoustic pulse downward, times the echo and converts it into a level, with a built-in temperature sensor compensating for the speed of sound in air.

The 6° beam angle is narrow enough for a 300 mm tank opening and wide enough to tolerate a slightly off-vertical mounting. Setup is by two buttons and a display, with a 4-20 mA output that can be inverted for distance or level, which saves a configuration step when replacing a failed unit in the field.

Key features

0.3-6 m range, ±0.25% FS accuracy
Built-in temperature compensation for speed of sound
4-20 mA output, invertible between level and distance
Two-button setup with local display
IP67 housing, PVC or PVDF transducer
Adjustable false-echo suppression for tank internals

Typical applications

Sump and wet well level with pump control
Water tank and reservoir inventory
Cooling tower basin level
Chemical tank level for non-foaming liquids

Where ultrasonic stops working

Foam, heavy vapour, condensation on the transducer and wind across an open tank all degrade an ultrasonic reading, usually by returning a plausible but wrong value rather than a fault. If any of those conditions apply, specify a radar sensor instead.

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DM-FV40 Vortex Flow Meter for Steam and Gas, DN15-DN300

Sat, 31 Oct 2026 09:33:16 +0000

Overview

The DM-FV40 measures steam and gas flow using the von Kármán vortex principle: a bluff body in the flow sheds vortices at a frequency proportional to velocity, and a piezoelectric sensor downstream counts them. There are no moving parts in the flow, so the meter does not wear and does not need a strainer or a bypass.

With the optional integrated PT100, the meter calculates compensated mass flow for saturated steam directly, so the control system receives a mass flow value instead of volumetric flow that has to be corrected elsewhere. The display shows flow, total, temperature and pressure on two lines.

Key features

DN15 to DN300, PN16 to PN40 flange connections
±1% of reading for liquids, ±1.5% for gases and steam
No moving parts, no strainer required
Integrated temperature compensation for saturated steam (option)
4-20 mA with HART 7, pulse and RS485 Modbus
Up to 400 °C media temperature with the high-temperature head

Typical applications

Steam header and branch metering
Compressed air consumption by production area
Natural gas and process gas flow
Boiler feedwater and condensate measurement

Sizing note

Vortex meters have a minimum Reynolds number, so an oversized meter will not register low flow. Size for the normal flow at 60-80% of range and confirm that the minimum flow stays above the meter’s lower limit; if it does not, choose a smaller size or a different technology.

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DM-FE150 Clamp-On Ultrasonic Flow Meter, DN15-DN600

Sat, 31 Oct 2026 09:33:14 +0000

Overview

The DM-FE150 measures flow from outside the pipe. Two transducers clamp onto the pipe wall, send an acoustic pulse diagonally through the liquid and back, and calculate flow from the transit-time difference in both directions. Nothing enters the process, so there is no pressure drop, no leak path and no shutdown to install it.

The controller accepts pipe outside diameter, wall thickness, material and lining, then calculates the transducer spacing itself. A mounting rail with a scale fixes the spacing and keeps it stable, and the supplied wall-thickness gauge removes the second-largest source of field error after straight run.

Key features

DN15 to DN600, ±1% of reading in calibrated conditions
Bidirectional measurement, totaliser and batch functions
4-20 mA, pulse, relay and RS485 Modbus outputs
Clamp-on installation with mounting rail and wall-thickness gauge
Data logging for up to 60 days at 1-minute intervals
Battery or 24 VDC powered versions

Typical applications

Flow verification and energy allocation on existing mains
Chilled and hot water loop balancing
Temporary flow surveys and leak detection
Process cooling water in semiconductor and data centre facilities

Installation requirements

Allow ten pipe diameters upstream and five downstream, keep the transducers on the side of a horizontal pipe rather than the top, and make sure the pipe is full. Clamp-on meters fail predictably when the pipe is partially full or when a liner separates the transducer from the liquid.

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DM-TS100 PT100 RTD Probe, -50 to +400 °C

Sat, 31 Oct 2026 09:33:12 +0000

Overview

The DM-TS100 is a general-purpose platinum resistance probe for process and utility temperature measurement. The element is a Class A PT100 in a 6 mm 316L stainless sheath, wired 4-wire so the lead resistance cancels out and the reading does not change when the cable length changes.

The probe is available with a fixed G1/2 thread or a spring-loaded compression fitting that holds the tip against the pipe wall or thermowell bottom. Spring loading removes the air gap that causes slow and low readings on immersion probes, which is the most common installation error in temperature measurement.

Key features

Class A PT100 element, ±0.15 °C at 0 °C, 4-wire connection
6 mm 316L stainless sheath, length 100 to 500 mm
Response time t90 = 8 s in flowing water
G1/2 thread, spring-loaded compression fitting or clamp connection
-50 to +400 °C range, IP67 connection head
Optional 3-point calibration certificate

Typical applications

Hot water and steam line temperature
Bearing and gearbox temperature monitoring
HVAC immersion and duct temperature
Sanitary process temperature with clamp connection

Selection note

Immersion depth should be at least ten sheath diameters in liquid and more in gas. A 6 mm probe fitted into a 30 mm pocket will read the pocket wall, not the process, and the error grows as the pipe temperature diverges from the media temperature.

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DM-PD100 Differential Pressure Transmitter, 0-10 kPa

Sat, 31 Oct 2026 09:33:11 +0000

Overview

The DM-PD100 measures the difference between two pressure ports rather than a single line pressure, which is what filter monitoring, room pressure cascades and orifice-plate flow measurement actually require. The two-port capsule is machined from a single stainless block, so thermal gradients across the body do not create the offset that plagues assembled differential sensors.

Accuracy is 0.075% of span, and the static line pressure rating of 160 bar means the transmitter can sit on a high-pressure filter housing while still resolving a 2 kPa pressure drop. The 4-20 mA output is loop-powered, and the zero and span are adjustable from the front panel without opening the housing.

Key features

0-10 kPa differential range with 160 bar static line pressure
0.075% FS accuracy including thermal effect over the compensated range
Single-block stainless capsule, no internal elastomer seals
Front-accessible zero and span adjustment
Two 1/4 NPT or G1/4 process ports with bleed valves
Optional three-valve manifold for in-service zeroing

Typical applications

Filter and strainer differential pressure monitoring
Cleanroom and corridor pressure cascade control
Orifice plate and Venturi flow measurement
Tank level by hydrostatic differential measurement

Installation note

Mount the transmitter below the tap points for liquid service and above them for gas, with equal-length impulse lines sloping continuously to the process. Unequal line length or a trapped condensate slug shifts the zero, and no amount of configuration will remove it.

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DM-PS500 Compact Pressure Switch, 0.5-10 bar

Sat, 31 Oct 2026 09:33:11 +0000

Overview

The DM-PS500 is a mechanical pressure switch for interlock and alarm duty where a continuous analogue signal is not needed. A stainless diaphragm acts on a snap-action microswitch, so the contact changes state decisively at the set point with no chatter at the threshold, which matters when the switch drives a contactor or a PLC input.

The set point is adjusted by a screw under the protective cap and the differential is fixed at 15% of the set point. The body is stainless steel with a G1/4 process connection and an IP67 housing, and the electrical connection is a DIN 43650 valve connector that keeps the terminal block sealed.

Key features

Adjustable set point 0.5-10 bar, fixed hysteresis 15% of set point
SPDT snap-action contact rated 5 A at 250 VAC
Stainless steel body and diaphragm, G1/4 process connection
DIN 43650 connector with IP67 protection
No supply voltage required, suitable for pure interlock circuits
Repeatability within 2% of set point over 100,000 cycles

Typical applications

Pump start and stop on pressure
Compressor low-pressure and high-pressure interlock
Filter clogging alarm
Machine guard and pneumatic clamp confirmation

When to use a switch instead of a transmitter

If the control system only needs a discrete signal at a threshold, a mechanical switch removes the analogue input card, the scaling and the calibration interval. If the threshold will change with product or season, a transmitter with a configurable set point is the better long-term choice.

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