HRM Series Mechanical Display Gas Roots Flowmeter – Reliable, Battery-Free, Cost-Effective

·  High Accuracy & Excellent Repeatability 

Accuracy up to ±1.0% or better, with stable long-term performance. Measurement is independent of gas density, pressure, or temperature fluctuations.

·  Support for IC Card Prepaid & Intelligent Functions 

Available in prepaid versions (HR/HRS pre-paid series) with IC card control, automatic valve shut-off, and options for remote monitoring via RS485/GPRS/IoT.

·  Explosion-Proof & Safety Certifications 

Ex d II BT4 Gb or higher explosion-proof rating, compliant with JJG 633 and JB/T 7385 standards, safe for Zone 1/2 hazardous gas areas.

·  Wide Turndown Ratio 

Wide flow range ratio (typically 1:10 to 1:20), suitable for both low and high flow rates, ideal for fluctuating gas usage in city gas and industrial applications.

Accuracy class

The accuracy levels are 1.0 and 1.5,and the allowable error limits for each accuracy level are as follows:

Level 1.0:Qt~Qmax:±1.0%,Qmin~Qt:±2.0%;

Level 1.5:Qt~Qmax:±1.5%,Qmin~Qt:±3.0%.

Useenvironment

Ambient temperature:-25°C~+60°C

Relative humidity:5%~95%

Medium temperature:-30°C~+80°C

Atmospheric pressure:70kPa~106kPa