ZMP Ultrasonic Level Transmitter: Compact Non-Contact Level Measurement for Industry Applications
Introduction
The ZPM lineup is a microprocessor-based ultrasonic level transmitter designed for precise measurement in ranges of 1 m and 2 m, making it particularly suitable for compact installations and localized monitoring points.
Unlike general-purpose level transmitters, the ZPM level measuring focuses on short-distance accuracy and installation convenience, with a typical accuracy of ±0.5% FS and a very small blind zone (as low as 0.06 m depending on range).
The device supports multiple output options, including 4–20 mA, voltage outputs, RS485 communication, and relay outputs, allowing it to function both as a standalone measurement device and as part of an automated system.
With built-in parameter configuration, adjustable output scaling, and support for both level and distance measurement, the ZPM provides flexibility that is often required in real industrial processes rather than ideal lab conditions.
Working theory
The ZPM operates using the ultrasonic time-of-flight measurement principle, optimized for short-range precision.
The sensor emits ultrasonic pulses toward the surface of the measured medium. These pulses travel through the air, reflect off the material surface, and return to the sensor. The system calculates the distance based on the travel time of the signal.
The internal processor then converts this distance into a level value based on the configured reference points.
In practical operation, the device offers additional flexibility:
-
Measurement can be configured as distance or level
-
Output range can be freely scaled between custom start and end points
-
Signal strength can be adjusted using multi-level emission intensity for different conditions
This allows the transmitter to adapt to small tanks, irregular geometries, or applications where standard scaling does not fit.
Key features
The ZPM ultrasonic level transmitter is designed around precision, flexibility, and adaptability in small-scale measurement environments.
- Short-Range High-Resolution Measurement: Optimized for 1 m and 2 m measurement ranges, ensuring stable and accurate performance in compact installations.
- Minimal Blind Zone for Tight Spaces: Blind zone as low as 0.06 m, making it suitable for shallow tanks or limited installation height.
- Flexible Output Configuration: Supports 4–20 mA, voltage outputs (0–5 V / 0–10 V), RS485, and relay outputs, allowing seamless integration into different control systems.
- Customizable Measurement Range and Scaling: Users can freely set output start/end points and switch between level and distance measurement modes.
- Adjustable Signal Emission Strength: Multi-level emission intensity improves measurement reliability under varying surface conditions, such as weak reflections.
- Digital Interface with OLED Display: Provides clear local indication with backlight, simplifying on-site configuration and monitoring.
- Low Power Consumption Design: Consumes less than 1.5W, supporting long-term continuous operation.
Specification
| Product | Ultrasonic level transmitter |
| Model | ZMP |
| Measure range | 0-1m, 0-2m |
| Blind zone | ＜0.06-0.15m（different for range） |
| Accuracy | 0.5% |
| Display | OLED |
| Output | 4-20mA, RS485, Relay |
| Power supply | 12-24VDC |
| Power consumption | <1.5W |
| Protection degree | IP65 |
Applications
The ZPM ultrasonic level transmitter is particularly suited for short-range, high-precision measurement scenarios where traditional level instruments may be oversized or impractical.
Small tanks and dosing systems
Accurate level monitoring in compact vessels where installation space is limited.
Water and wastewater equipment
Used in small basins, chemical dosing tanks, and localized treatment units of the water and wastewater processing plants.
Food and liquid processing
Suitable for edible oils, sauces, food and beverage tanks where non-contact measurement is preferred.
Chemical and light industrial applications
Compatible with solvents, coatings, and other liquid media requiring non-contact measurement.
Bulk material storage (short range)
Applicable for granular materials such as flour or grains in small silos or containers.
These applications benefit from the transmitter’s ability to deliver accurate readings in confined spaces without direct contact with the medium.
