Oil & Gas Sensor Solutions | DuoMy Industrial Sensors

DM-SD24 Loop-Powered Digital Indicator with 2 Relays

Sat, 31 Oct 2026 09:33:24 +0000

Overview

The DM-SD24 takes its power from the current loop it is measuring, so installing it means breaking the loop and inserting the indicator, nothing more. It displays the scaled value in engineering units and provides two relays that can be set as high, low or window alarms with adjustable hysteresis and delay.

That combination replaces a separate display and trip amplifier in many panels. It is particularly useful on remote or skid-mounted equipment where an operator needs to see the value and where a local alarm must act even if the control system is offline.

Key features

Two-wire, loop-powered, no separate supply required
4-digit display with configurable engineering units and scaling
Two relays configurable as high, low or window alarm
Adjustable hysteresis and 0-60 s alarm delay
IP65 front face for panel or field mounting
Voltage drop of only 2.5 V, minimising loop burden

Typical applications

Local readout on pump and valve skids
Over-temperature and dry-run alarms
Level indication on remote tanks
Flow totalising display at a metering point

Loop budget note

A two-wire indicator adds to the loop resistance. Check that the transmitter’s minimum supply voltage plus the indicator’s voltage drop plus the cable and sense resistor still falls below the available supply, especially on 12 V loops.

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DM-SC04 4-Channel Isolating Signal Conditioner

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

Overview

The DM-SC04 puts four isolated channels into a 22.5 mm DIN-rail module. Each channel accepts 4-20 mA, 0-10 V, RTD, thermocouple or potentiometer input and produces a 4-20 mA or 0-10 V output, with 1,500 VAC isolation between input, output and supply.

The practical value is in retrofits. When a panel picks up noise from a new variable frequency drive, or when a sensor in another building creates an earth loop, adding an isolating conditioner at the panel boundary fixes the signal without touching the sensor, the cable route or the PLC card.

Key features

Four isolated channels in a 22.5 mm DIN-rail module
Universal input: mA, V, RTD, thermocouple, potentiometer
1,500 VAC three-way galvanic isolation
0.1% of span accuracy with 10-50 ms response
DIP switch configuration, no software required
Removable terminals and channel status LEDs

Typical applications

Breaking earth loops on long analogue runs
Rejecting common-mode noise from VFDs and welders
Converting RTD or thermocouple signals to 4-20 mA
Standardising mixed signals in a retrofit panel

Wiring note

Isolation removes the conductive path, but it does not fix a bad shield termination. Bond the cable shield at one end only, keep the shield continuous through junction boxes, and separate signal cable from drive output cable by at least 200 mm in the duct.

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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-LR60 80 GHz Radar Level Transmitter, 0-30 m

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

Overview

The DM-LR60 uses an 80 GHz frequency-modulated continuous-wave radar to measure the distance to a liquid or solid surface without contact. The short wavelength gives a narrow 4° beam, which is what allows the transmitter to be mounted in a tank with agitators, heating coils and inlet streams without picking up a reflection from any of them.

Because the measurement is electromagnetic rather than acoustic, vapour, dust, foam and wind have far less effect than they do on an ultrasonic sensor. Setup is done over Bluetooth from a phone or over HART from the control system, and the empty and full calibration can be entered as distances rather than as percentages, which removes a common source of configuration error.

Key features

0-30 m range with ±3 mm accuracy
80 GHz FMCW, 4° beam angle
Unaffected by vapour, dust and most foam
4-20 mA with HART 7 and Bluetooth configuration
PTFE or PFA antenna for corrosive media
Process temperature -40 to +150 °C, pressure -1 to 40 bar

Typical applications

Wet wells, sumps and pump stations
Fermentation and buffer tanks with foam
Silo and hopper inventory for powders and pellets
Chemical storage tanks with corrosive vapours

Mounting note

Keep the antenna clear of the tank wall by at least 100 mm and away from the inlet stream. A nozzle that protrudes more than its own diameter into the tank creates a false echo that no configuration can remove, so shorten the nozzle or use a flush antenna.

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DM-TT200 Head-Mount Temperature Transmitter, 4-20 mA / HART

Sat, 31 Oct 2026 09:33:13 +0000

Overview

The DM-TT200 converts an RTD or thermocouple signal into a 4-20 mA loop inside the connection head, metres away from the measurement point. That short analogue path is the whole point: the low-level sensor signal stays inside a shielded head instead of travelling down a cable next to a drive, and the control system receives a robust current loop.

The input is universal and configured by software, covering PT100, PT1000, Ni1000, thermocouple types K, J, T, E, N, R, S, B, and millivolt or resistance inputs. Sensor matching (Callendar-Van Dusen coefficients) can be entered for a specific probe, which brings a standard Class A element closer to a calibrated pair without buying a tighter element.

Key features

Universal input: RTD, thermocouple, mV, resistance
4-20 mA output with HART 7 digital communication
1,500 VAC galvanic isolation between input and output
Sensor matching via CVD coefficients for individual probes
Sensor break and short-circuit detection with configurable drive
Fits DIN B connection heads, 34 mm diameter, 22 mm height

Typical applications

Process temperature loops on RTD and thermocouple probes
Retrofit of direct-wired RTDs onto an existing 4-20 mA card
Hazardous-area loops with intrinsic safety barriers
Sanitary probe assemblies in food and pharmaceutical service

Commissioning note

Configure the input type and range before installation, then verify the loop current at two points. A transmitter configured for a 3-wire PT100 on a 4-wire probe will read a plausible but wrong value, which is harder to find later than an outright failure.

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DM-PT2150 Stainless Steel Pressure Transmitter, 0-400 bar

Sat, 31 Oct 2026 09:33:10 +0000

Overview

The DM-PT2150 is a two-wire gauge pressure transmitter built for continuous service on hydraulic power units, process piping and water networks. The sensing element is a piezoresistive silicon capsule isolated by a 316L stainless steel diaphragm, so the electronics never touch the media and the wetted path has no elastomer seal in the pressure boundary.

The 4-20 mA output is standard, with HART 7 available on the same terminals for remote range and damping configuration. A laser-welded stainless housing with an M12 connector gives IP68 protection without relying on a cable gland, which is the most common water entry point on pressure instruments in washdown or outdoor service.

Key features

0-400 bar range with 2x overload rating and 0.25% FS total error band
316L stainless steel wetted parts, no internal elastomer in the pressure boundary
4-20 mA two-wire loop power, 10-32 VDC, with optional HART 7
IP68 laser-welded housing with M12 A-coded connector
G1/4, G1/2, NPT 1/4 and NPT 1/2 process connections from stock
Factory calibration certificate traceable to national standards supplied with every unit

Typical applications

Hydraulic power unit line pressure and return monitoring
Pump discharge pressure and dry-run protection
Booster set and water network pressure logging
Compressor and pneumatic supply monitoring

Why this model

Most 400 bar transmitters in this price bracket use a ceramic or thin-film element with a sealing O-ring in the pressure path. The PT2150 uses a welded stainless diaphragm and a metal-to-metal process seal, so it holds calibration in thermal cycling and does not develop a leak path after a few thousand pressure cycles.

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