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JJY YLD128D W 32
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M38 Thread Radar Level Transmitter (38 mm Body)

Model JJY-YLD128D-W-32
Communication 【RS485】 / 【4-20mA / 2-Wire】/toggled via RadarBLE app
Average Current 【RS485:12V/10mA】 / 【4-20mA / 2-Wire:24V/3.4mA】
Operating Voltage 【RS485:12-24V】 / 【4-20mA / 2-Wire:20-24V】
Sampling Frequency 200ms / 1500ms/Configurable
Measurement Accuracy ±3mm / Beam Angle:±3°
Measuring Range 0.05-2m Blind zone distance 0.05m
Communication Protocol Customizable Modbus / Text Protocol
Mounting Type Thread M38×1.5 Pitch
Prot. Class / Temp. IP66/-40℃~75℃
Housing Mat. / Cable PTFE / Nickel-Plated Copper /0.5m
Configuration Software Windows Serial Port Debugger / Android & iOS — RadarBLE app
Packaging Dims. & Wt. 80*80*100MM/320g
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The JJY-YLD128D-W-32 is a compact FMCW radar level transmitter built for small tanks, water tanks and non-sealed metal vessels up to 2 m high. With a 38 mm body diameter and an M38×1.5 mounting thread, it fits through a standard tank-top boss where conventional flange-mounted gauges will not. Output is available as 2-wire 4-20 mA or RS485 Modbus-RTU — and you can switch between the two from the RadarBLE app, without opening the housing.

38 mm body4-20 mA / RS485MOQ: 1 unit✓ Modbus remap — no PLC change✓ Free standard sample✓ 3D housing STP file

JiaJia Eye is an ISO 9001:2015 certified manufacturer in Shenzhen, established in 2015. We supply OEM/ODM buyers and instrument distributors across Southeast Asia — water treatment, palm oil, rubber, food & beverage — with free samples, custom measuring ranges, custom protocols and private labelling.

Key Features

Modbus rewritten for your PLC

Replacing another vendor’s radar gauge? We map the transmitter’s Modbus register layout to the protocol your PLC already speaks — no PLC reprogramming, no downtime for your integrator.

Fits where a flange gauge will not

At only 38 mm in diameter with an M38×1.5 thread, it installs through a standard tank-top boss — the usual answer when a flange-mounted transmitter simply does not fit.

Two outputs in one device

RS485 and 2-wire 4-20 mA, toggled in the field via the RadarBLE app (Android & iOS) / the WeChat mini program (English & Chinese).

Typical Applications

Water & wastewater / municipal pump stations

Sewage pits, fire-water tanks and PLC level feedback loops.

Palm oil and rubber processing tanks

Stable, contactless measurement in non-steaming, moderate-temperature vessels — the core industries of Southeast Asia.

Automated production lines

Fixed-position level monitoring of process material in hoppers and day tanks.

Dimensions, Wiring & Installation

M38 thread radar level transmitter with 38 mm body
JJY-YLD128D-W-32 — 38 mm body diameter, available with a PTFE (white) or nickel-plated copper housing.
JJY-YLD128D-W-32 dimension drawing, M38x1.5 mounting thread, 38 mm body diameter
Dimension drawing — M38×1.5 thread, 38 mm body. Enlarge
JJY-YLD128D-W-32 wiring diagram, RS485 and 2-wire 4-20 mA connections
Wiring — RS485 and 2-wire 4-20 mA. Enlarge
JJY-YLD128D-W-32 installation position and mounting angle guide
Installation position and mounting angle. Enlarge
JJY-YLD128D-W-32 installation precautions guide
Installation precautions. Enlarge

What’s in the Box

  • Radar level transmitter main unit × 1
  • M38 stainless steel thread fitting × 2
  • User manual × 1
  • 0.5 m connecting cable × 1

Related Radar Level Transmitters

Frequently Asked Questions

Will it fit where a flange gauge will not?

At only 38 mm in diameter with an M38×1.5 thread, it installs through a standard tank-top boss — the usual answer when a flange-mounted transmitter simply does not fit small tanks, water tanks and non-sealed metal vessels.

My PLC is already wired to another brand’s radar gauge. Will yours connect without reprogramming?

Yes. We map the transmitter’s Modbus register layout to the protocol your PLC already speaks, so the existing PLC program stays untouched and your integrator suffers no downtime. Configuration is done from the RadarBLE app (Android & iOS) / the WeChat mini program.

Can I switch between 4-20 mA and RS485 in the field?

Yes. The same unit carries both RS485 and 2-wire 4-20 mA, and you toggle between them from the RadarBLE app / WeChat mini program without opening the housing.

What measuring range is it built for?

It is built for small tanks, water tanks and non-sealed metal vessels up to 2 m high — the compact answer where a full-size flange transmitter will not fit.

What is the housing made of?

It is available with a PTFE (white) or a nickel-plated copper housing, so you can match the body to the vessel and the process environment.

What is the MOQ?

One unit. There is no minimum order quantity: a single evaluation unit, a 20-unit trial order and a 500-unit batch are all accepted. Quantities under 20 units ship directly from stock; 20–500 units are scheduled into production.

How fast is delivery?

1–20 units: dispatched within 2 working days from stock. 20–500 units: 1–4 weeks for a scheduled production run, depending on the current schedule. Customised versions follow exactly the same schedule — customisation does not extend the lead time.

Can range, thread and protocol be customised? Can I get a sample?

Measuring range, the M38×1.5 mounting thread, output (4-20 mA / RS485), protocol and housing (PTFE / nickel-plated copper) are all customisable. One free sample is provided — the buyer covers the freight.

What certifications do you hold?

ISO 9001:2015 (certificate 02426Q00028R101, valid until 2029-01-15). CE certification is in preparation.

Delivery & Samples

Sample or replacement unit: ships in 2 working daysStock is held for evaluation samples and urgent replacements — when a gauge has failed and the line is down, that is the difference between a two-day stoppage and a four-week one.
2working days
Samples and orders of 1–20 units — in stock

Dispatched within 2 working days of payment confirmation.

1–4weeks
Production runs of 20–500 units

Depending on the production schedule: 1 week when a run is already planned, up to 4 weeks at peak, followed by calibration, 48 h burn-in and waterproof testing.

Sameschedule
Custom range / protocol / housing

Customisation adds no extra lead time.

3D files — STP housing file for your enclosure design.
FORM E zero-duty — China–ASEAN certificate of origin; import duty can drop to zero for Vietnam, Thailand, Indonesia, Malaysia and the Philippines.
Private label — your brand on the housing and the datasheet.
Free sample: one standard unit free of charge, buyer covers freight.
MOQ: 1 unit — single evaluation orders are welcome.
Stock: standard version held in stock for 1–20 units.
Shipping: express air from Shenzhen, or consolidated sea freight for batch orders.
Lead time counts from payment confirmation, working days only.

Ordering & OEM

Tell us the tank height, output signal and quantity — our engineers reply within two working days with a quotation, a sample arrangement or the 3D files for your enclosure design.

Request a quotation or a free sample →

Looking for the full range? Browse all radar level sensors →

Every file here is free — no registration and no email wall. Files marked Download open straight away; where the direct link is not live yet, the file is emailed to you within one working day.

Downloads — JJY-YLD128D-W-32

User Manual

Installation, wiring, parameter configuration and upper-computer software setup.

PDF · 1.0 MB · English · 2026-09-05

Download

Communication Protocol

Modbus-RTU register map for the RS-485 interface. A custom text protocol can be written for OEM projects.

PDF · 1.2 MB · English · v1.0

Download

3D Model — housing envelope (.stp)

STP AP214 solid of the housing, M38×1.5 thread and 38 mm body, for enclosure and mounting-boss design.

Download

Upper-Computer Configuration Software

Parameter setup, data logging, range calibration and firmware upgrade from a Windows PC.

Windows 7 / 10 / 11 · ZIP · 31 MB · v2026.06

Download

RadarBLE — Bluetooth APP for Android

Search RadarBLE on Google Play, or install the APK. On-site pairing, output switching, configuration and live readings from your phone.

Download

RadarBLE — Bluetooth APP for iOS

Search RadarBLE in the App Store. On-site pairing, output switching, configuration and live readings from your iPhone

Download

Video: Radar Level Transmitters Operation Video

Wiring, COM port settings, parameter setup and live data view.

Watch on YouTube

Video: RadarBLE APP operation

Pair the gauge, configure parameters and monitor readings from your phone.

▶ Watch on YouTube

RadarBLE (iOS) availability: United States, Canada, Germany, France, United Kingdom, Italy, Spain, Greece, Japan, South Korea, Australia, New Zealand, Singapore, Malaysia, Thailand, Philippines, Indonesia, Vietnam, Mexico, Brazil, Saudi Arabia, United Arab Emirates, Turkey, Mainland China, Hong Kong (China).

Need Another Document?

Need a datasheet, 3D file, test report or a manual in another language? Tell us what you need:

  • Email: [email protected]
  • Phone: +86 400 189 9309 (General) / +86 18124514139 (Mobile)
  • Hours: 09:00–18:00 China Standard Time, Mon–Fri

Copyright @ 2026 JiaJia Eye

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