MT300 Precision Pressure Monitor
0.01% measurement accuracy. Long-term stability backed by data.
The MT300 Precision Pressure Monitor is a high-accuracy pressure instrument equipped with Yokogawa's proprietary silicon-based resonant sensor. It delivers 0.01% accuracy and long-term stability backed by years of accumulated measurement data. Unlike conventional high-accuracy pressure monitors that are limited to gas-only measurement, the MT300 also supports liquid measurement and differential pressure measurement with a single unit.
From precision calibration in the lab to transmitter calibration in the field, the MT300 combines battery-powered portability with high accuracy to meet a wide range of pressure measurement needs.
Table of Contents
Why Choose the MT300
High-Accuracy Liquid and Gas Measurement
The MT300 is a digital pressure monitor capable of high-accuracy measurement of both liquids and gases at low pressures. While conventional high-accuracy pressure monitors are often limited to gas-only measurement, the MT300 also supports liquid-based applications.
In recent years, the need for high-accuracy liquid pressure measurement has been expanding in areas such as EV (electric vehicle) cooling systems and data center cooling water systems. The MT300 can reliably capture even minute pressure changes in the low-pressure range for these applications. Compatible fluids include non-flammable, non-explosive, non-toxic, and non-corrosive liquids and gases (excluding substances defined under EU Pressure Equipment Directive 2014/68/EC Article 13(1)(a)).
Long-Term Stability Adopted for International Comparisons
The MT300 guarantees 0.01% accuracy for a period of 12 months. This accuracy guarantee is backed by years of accumulated measurement data. Internal evaluation data confirms that measurement drift remains extremely small even after 2,000 days.
Yokogawa's pressure sensors and the MT series have been adopted as Transfer Standards for international comparisons of pressure standards conducted by national metrology institutes. (Transfer Standard: a standard used as transfer equipment to compare standards.)
Differential Pressure Measurement with a Single Unit
The MT300 differential pressure model enables differential pressure (∆P) measurement with a single unit. In conventional differential pressure measurement, two pressure monitors are used to measure each pressure independently, and the difference is then calculated. With this two-unit method, the accuracy of each sensor accumulates (e.g., 0.01% × 2 = 0.02%), reducing the overall differential pressure measurement accuracy. The MT300 differential pressure model measures differential pressure directly using a single integrated sensor, eliminating accuracy accumulation.
By completing the measurement with a single unit, the MT300 simplifies the measurement system, saves space, and streamlines data acquisition. It is effective in applications where high-accuracy differential pressure measurement is required, such as HVAC airflow testing, wind tunnel testing, and component pressure drop measurement.
| MT300 | Conventional Differential Pressure Measurement | |
|---|---|---|
| Differential Pressure Measurement Method | Measurement with a single integrated pressure sensor | Measurement with two independent sensor modules |
| Differential Pressure Display Method | Direct display of differential pressure value | Two measured values displayed separately |
| Confirming the Differential Pressure Value | Direct readout | Calculated from two measured values |
| Sensor Accuracy | Accuracy maintained as-is with single-sensor measurement (e.g., 0.01%) | Accuracy of two sensors accumulates (e.g., 0.01% × 2 = 0.02%) |
Laboratory-Grade Calibration in the Field
The MT300 is equipped with the functions needed for transmitter calibration and maintenance in field environments. With the /DM option, it can supply 24 VDC to a transmitter while directly measuring its output signal (1–5 V or 4–20 mA).
The MT300's strength lies in delivering laboratory-grade accuracy that handheld calibrators cannot achieve, even in field environments. It enables high-accuracy calibration, verification, and loop checks to be performed on-site, ensuring confidence in measurement results. With the /EB option Li-ion battery, cordless operation of up to approximately 6 hours is possible even without an AC power source.
High Overpressure Protection
The MT300 provides high overpressure protection, particularly in the low-pressure ranges. The 1 kPa range withstands up to 50 kPa (50 times the range), and the 10 kPa range withstands up to 50 kPa (5 times the range). Conventional pressure monitors typically offer overpressure protection of only 1.1 to 1.2 times the range, posing a risk of failure due to accidental overpressure.
Unintended overpressure during experiments is not uncommon. In particular, when measuring small differential pressures in environments with high line pressure, robust overpressure protection is critical. The MT300's high overpressure design reduces the risk of damage in such situations and supports long-term stable operation.
| Range | Allowable Input | |
|---|---|---|
| 1 kPa | 50 kPa | Range × 50.0 |
| 200 kPa | 500 kPa | Range × 2.5 |
| 70 MPa | 98 MPa | Range × 1.4 |
Key Functions
High Resolution Display
By selecting the /R1 option, one additional digit can be added to the pressure measurement display. The improved display resolution contributes to reducing uncertainty in calibration environments.
The MT300 features a 4.3-inch TFT color LCD (480 × 272 dots), providing high-visibility display of measurement data.
High Speed Measurement and Synchronous Measurement
With the /F1 option, you can choose from three measurement modes: normal, medium, and high speed. In high-speed mode, response times of 100 ms or less are achieved (varies by model), enabling reliable capture of transient pressure responses and rapid fluctuations.
The synchronous measurement function allows up to four MT300 units to be daisy-chained for high-speed, high-accuracy simultaneous measurement at multiple points. For example, in suction power testing of vacuum cleaners (IEC 60312), synchronous measurement using a differential pressure model and an absolute pressure model enables simultaneous high-accuracy acquisition of suction air volume and vacuum level.
Leak Test and Statistical Processing
The MT300 is equipped with a variety of functions to support efficient pressure measurement.
| Leak Test | Measures pressure change or leak rate (pressure change per minute) within the measurement period. Can be used to check the tightness or integrity of a pressure measurement system. |
|---|---|
| Statistical Processing | Displays the maximum, minimum, average, and standard deviation of continuously acquired data. |
| Scaling | User-defined coefficients can be set to display converted values. Custom unit display is available to suit the application. |
| D/A Output (/DA Option) | Converts measured values via D/A conversion and outputs them from external terminals. Data output to external recorders or measurement systems is easily performed. When combined with the /F1 option, the output update interval can be set to 250 μs. |
Product Lineup
Gauge Pressure Model
A model for pressure measurement referenced to atmospheric pressure. Six ranges are available to cover a wide range of applications.
| Range | 10kPa / 200kPa / 1000kPa / 3500kPa / 16MPa / 70MPa |
|---|---|
| Typical Applications | Pressure calibration reference, production line inspection, pressure loss measurement, etc. |
About the 70 MPa Model
The 70 MPa model is a sealed gauge pressure model. It supports measurement in the high-pressure range.
Absolute Pressure Model
A model for pressure measurement referenced to vacuum. Used for atmospheric pressure measurement and monitoring of vacuum processes. Equipped with a tilt correction function that compensates for measurement value offset when the unit is used in a vertical orientation.
| Range | 130kPa / 700kPa / 3500kPa |
|---|---|
| Typical Applications | Atmospheric pressure measurement, vacuum process monitoring, reference pressure measurement in calibration using a pressure balance |
Differential Pressure Model
A model that enables differential pressure measurement with a single unit. It is equipped with two pressure input ports and measures differential pressure directly using an integrated sensor.
| Range | 1kPa / 10kPa / 130kPa / 700kPa |
|---|---|
| Typical Applications | EV cooling system pressure loss measurement, HVAC testing, wind tunnel testing, component pressure loss measurement |
Application Examples
Applications by Industry
The MT300 is used across a wide range of industries where calibration and measurement accuracy are essential.
| Metrology Standards & Calibration Organizations |
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|---|---|
| Automotive (EV) |
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| HVAC & Appliances |
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| Medical Devices |
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| Plant |
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| Industrial Equipment |
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| Infrastructure |
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| Data Centers |
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| Cleanrooms |
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Pressure Reference for Pressure Balance Calibration
When using a pressure balance (dead weight piston gauge) for calibration, a reference instrument is needed to confirm that the calibration values are being generated correctly, as well as a high-accuracy pressure monitor to measure atmospheric pressure. The MT300 provides the high accuracy, high resolution, and long-term stability required for this application.
When using the MT300 as an in-house reference standard, its high long-term stability results in minimal accuracy drift between calibration cycles, reducing the cost and administrative burden of recalibration. The MT300 has also been adopted as a Transfer Standard in international comparisons and is widely used in the field of metrology standards.
Coolant Flow Pressure Loss Measurement in EV Cooling Systems
EVs contain many heat-generating devices, including motors, batteries, inverters, and power control units. Since each device generates different amounts of heat and has a different optimal temperature, a single vehicle is typically equipped with multiple cooling systems. In the design and development of cooling systems, measuring the pressure loss in coolant flow paths is essential.
The MT300 differential pressure model is also compatible with liquids, enabling high-accuracy measurement of coolant pressure loss with a single unit. With ranges and resolution suited to the measurement target, the MT300 contributes to performance evaluation and optimization of EV cooling systems.
Evaluation of Air Conditioner Performance
In cooling and heating performance testing of air conditioners, performance values are calculated from the differential pressure before and after an air flow measurement nozzle and the air temperature/humidity. The test must be performed in an equilibrium state, requiring accurate measurement of internal and external pressures. The MT300 with the /F1 option supports high-speed measurement of rapidly changing pressures, contributing to improved accuracy of performance testing.
In the same HVAC and appliance field, a configuration using synchronous measurement with a differential pressure model and an absolute pressure model is also utilized for vacuum cleaner suction power testing (IEC 60312).
Field Calibration and Maintenance
In field environments such as plants, calibration, verification, and loop checks of installed transmitters need to be performed on-site. Using the /DM option of the MT300, you can supply 24 VDC to the transmitter to power it, and directly measure its output signal (1–5 V or 4–20 mA) — completing the entire process with a single unit.
With the /EB option Li-ion battery, approximately 6 hours of continuous operation is possible even at sites without AC power. GPIB, USB, and Ethernet communication interfaces are standard, allowing easy integration with existing measurement systems.
About Yokogawa Test & Measurement
Business Overview
Yokogawa Test & Measurement Corporation is the test and measurement instrument business of the Yokogawa Electric Group. The company develops, manufactures, and sells a wide range of precision measurement solutions, including oscilloscopes, power analyzers, data acquisition systems, optical communication test equipment, and pressure measurement instruments.
The Yokogawa Electric Group has a track record of over 100 years in the development and provision of precision measurement instruments. In the field of pressure measurement, the group has accumulated technology over many years and developed a pressure measurement platform built around its proprietary silicon-based resonant sensor technology. Through a product portfolio spanning from lab to field — including the MT300, the CA700 Pressure Calibrator, and the MC300 Pressure Controller — Yokogawa supports customers' pressure measurement needs.
Company Profile
| Company Name | Yokogawa Test & Measurement Corporation |
|---|---|
| Headquarters | 9-8, Myojin-cho 4-chome, Hachioji-shi, Tokyo 192-8566, Japan — Keio Hachioji Myojin-cho Building |
| Established | July 1954 |
| URL | https://tmi.yokogawa.com/ |