Showing 17–25 of 25 results
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- NB-IoT / wireless remote-transmission instrument series: pressure, temperature, level and flow
- Battery-powered field devices with integrated wireless antenna — no signal cabling
- Positioned as smart IoT terminal hardware; custom control logic supported
- Wireless pressure gauge, temperature probe, submersible level device and electromagnetic-flowmeter-style device in one family
- Configured to order — tell us your measurement points and platform requirements
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- Transit-time ultrasonic flowmeter family: inline (pipe-section), clamp-on and open-channel versions
- Accuracy better than 1%, repeatability better than 0.2%; 500ms measuring period (128 samples)
- Inline sizes: flanged DN15-1000 (rated 2.5/1.6/1.0/0.6 MPa by size), union (sanitary) DN25-100
- Outputs: isolated RS485, OCT pulse, relay, 4-20mA; protocols MODBUS, M-BUS, FUJ extended
- Inputs: 3× 4-20mA (pressure/level/temperature) + 2× 3-wire PT100; data logging 512 days / 128 months / 10 years
- Supply isolated DC8~36V or AC85~264V; IP65/IP68
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- Magnetic float drives red/white 180° flipping indicators — no power needed for local indication
- Working pressure up to 16 MPa
- Medium temperature: standard ≤350 °C; remote type ≤80 °C; anti-corrosion type ≤120 °C
- Wetted materials: 316, 316L, 304, PTFE-lined 304, PVC, PP
- Options: ON/OFF level switches (no external power), 4–20 mA remote transmitter, drain valve
- Explosion-proof option ExibCT4; side-mount (code C) or top-mount (code D)
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- Karman vortex-shedding flowmeter for liquid, gas and steam, DN20–DN300
- Accuracy: liquid ±0.5 of reading; gas/steam ±1.0, ±1.5; turndown 1:10 / 1:15
- Medium temperature -40~+250℃ / -40~+350℃; pressure ratings PN1.6MPa, PN2.5MPa, PN4.0MPa
- Outputs: pulse 0.1~3000Hz or 4~20mADC 2-wire; supply +12VDC(+24VDC), +24VDC or 3.6V lithium battery (≥5-year, field display type)
- Temperature & pressure (T&P) compensated versions for steam/gas mass flow
- ExdIIBT6, IP65, vibration tolerance 1.0g
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- Liquid turbine flowmeter, DN4~DN200; flow from 0.04-0.25m³/h (DN4) up to 80-800m³/h (DN200)
- Accuracy ±0.5%R / ±1.0%R; short-term repeatability 0.05%-0.2%
- Variants: WKGY-N pulse output, WKGY-A 4-20mA 2-wire, WKGY-B battery-powered local display; RS485 / HART options
- 304 / 316(L) stainless body; medium temperature -20~+120℃
- Threaded ≤DN40 up to 6.3Mpa; flanged DN50-DN200 up to 2.5Mpa
- Explosion-proof option ExdIIBT6; signal transmission up to 1000m
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- Smart magnetic flowmeter for conductive liquids (conductivity ≥5uS/cm), DN10–DN3000
- Accuracy ±0.3% of reading (DN15–DN600, v≥1m/s); ±0.5% (DN700–DN3000); turndown 1500:1
- Max velocity 15m/s; pressure ratings up to 4.0MPa standard, 6.3/10MPa special order
- Liner options PTFE (F4), FEP (F46), PFA, neoprene, polyurethane; 7 electrode materials incl. Hastelloy B/C, Ti, Ta, Pt-Ir
- Outputs 4-20mA/pulse, RS232C, RS485, HART; supply 220VAC 50Hz or 24VDC
- Integral, remote, submersible-remote and explosion-proof versions
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- Ranges 0.3–5 m, 0.3–8 m, 0.5–12 m (selection L = 4–40 m)
- Accuracy ±0.3% × range; minimum resolution 1 mm; 12° beam angle
- Outputs: 4–20 mA (load >300 Ω), 0–5 V / 1–5 V, RS485 (Modbus), NPN switch
- Supply DC12–24 V, power <1.5 W; IP65
- Compact PP housing Φ83×145 mm, M65×1.5 mount; from 272 g
- Five types A–E: integrated 2/3/4-wire and split 4-wire versions
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- Dial sizes Φ60, Φ100 and Φ150 mm
- Measuring ranges from -80–40 °C up to 0–500 °C (per model table)
- Accuracy class 1.5
- Radial, axial and electric-contact (switching/alarm) forms
- Stem Φ6 / Φ10; threads M16×1.5, M20×1.5, M27×2, NPT
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- Measuring range -80–500 °C
- Accuracy ±1% F·S; long-term stability ±0.5% F·S/year
- Radial (WST-411), axial (WST-401) and WST-481 forms
- Stem Φ12; insertion length 100–2000 mm, customizable
- Process connection 1/2″, 3/4″ or M27×2 (customizable)
- For gases and liquids (specify corrosive media when ordering)
Product Categories
- Pressure Transmitters — Gauge, absolute and differential pressure, monocrystalline silicon sensors up to ±0.05%, 4-20 mA/HART.
- Pressure Gauges — General purpose, stainless steel, diaphragm-seal, electric contact and digital gauges.
- Temperature Instruments — Thermocouples, RTDs, bimetal thermometers and integrated temperature transmitters.
- Level Instruments — 80 GHz radar, ultrasonic, submersible hydrostatic and magnetic level instruments.
- Flow Meters — Electromagnetic, vortex, turbine and ultrasonic flow meters, DN10 to DN3000.
- IoT & Wireless Telemetry — NB-IoT pressure and level transmitters and wireless data loggers for remote sites.
Why Buy Factory-Direct from WELK Meters
- One factory, full scope — pressure, temperature, level, flow and telemetry from a single supplier with matching documentation.
- Small MOQ welcome — sample orders and pilot quantities accepted; T/T and L/C terms negotiable.
- OEM/ODM supported — private label, custom ranges and special process connections from small volumes.
- Engineer-direct support — send your specification or an OEM part number and get a recommendation within 24 hours.
- Calibrated before shipment — every instrument ships with a factory calibration record and English documentation.
Can't find the model you need? Send us your specification — we engineer instruments to customer requirements when standard models do not fit.
