HOFFER-HFRZ SERIES THERMAL GAS MASS FLOWMETER

Writer： admin Time：2021-03-08 17:19 Browse： ℃

1.Introduction
HOFFER’s HFRZ Series Thermal Gas Mass Flowmeter is designed on the basis of thermal dispersion, and adopts method of constant differential temperature to measuring gas flow. It has advantages of small size, easy installation, high reliability and high accuracy, etc.
The meter contains two platinum resistance temperature sensors. The thermal principle operates by monitoring the cooling effect of a gas stream as it passes over a heated sensor. Gas flowing through the sensing section passes over two sensors one of which is used conventionally as a temperature sensor, whilst the other is used as a heater. The temperature sensor monitors the actual process values whilst the heater is maintained at a constant differential temperature above this by varying the power consumed by the sensor. The greater the gas velocity, the greater the cooling effect and power required to maintain the differential temperature. The measured heater power is therefore a measure of the gas mass flow rate. 

2.Features
   ♦ It can measure high temperature hot air, above 260℃
   ♦ Can measure: compressed air, all kinds of gas, gas containing impurities, mixed gas
   ♦ It can measure mass flow and standard volume flow
   ♦ Measurement velocity width: 1Nm/s ~ 120Nm/s, range ratio can reach 1:120
   ♦ High accuracy: ±1.5%, ±1.0%, ±0.5%
   ♦ Easy to install and maintain, it can be installed and maintained without stopping production
   ♦ It can be adjusted on site
   ♦ Data mode: 4-20mA, RS-485, HART, can achieve factory automation integration
   ♦ Adopted 8.3 accreditation standards and NIST traceable certification
   ♦ Explosion-proof technology is adopted to ensure the safety of the instrument
   ♦ International standard: EN1434, FIL2

3.Specification
   ♦ Flow Range:0.15~3,000,000 NM3/hr
   ♦ Line Sizes:   3/8”~120”(10~3000 mm)
   ♦ Process Connections: Flanged (NPT, Welding available on request.)
   ♦ Accuracy: ±0.5%、±1.0%、±1.5%
   ♦ Repeatability: ±0.075% of reading
   ♦ Frequency:   10-2000 Hz
   ♦ Display: Color Graphic OLED, NM3/hr, KG/hr,NM3,KG
   ♦ Zero Stability: 0.1% full-scale
   ♦ Zero Drift (%FS / °C): 0.005
   ♦ Process Temperature:-58~292 °F (-50~100 °C) –std
                                         -58~392 °F (-50~200 °C) –opt
   ♦ Max Working Pressure: 360~930 psig (2.5~16MPA)
   ♦ Measuring Tube Mat’l: SS per DIN1.4571 (AISI 316Ti) standard
   ♦ Housing Material: SS #304
   ♦ Power Supply: 24 VDC, ± 20%; 86~260VAC,50~60Hz
   ♦ Power Consumption: Less than 6W
   ♦ Outputs.: 4~20 mA, 0~10 kHz pulse, RS-485

4.Model Selection Guide
 

HFRZ	**-	*-	**-	*-	*-	*-	***-	**-	**-	**-	Description
3/8”（DN10）	3/8										Size
1/2”（DN15）	1/2
1”（DN25）	1
1½”（DN40）	1½”
2”（DN50）	2
……	…
Pipeline type		PL									Meter type
plug-in type		I
ANSI 150#(2.5 Mpa)			F1								Process Connection
ANSI 300#(5.0 Mpa )			F3
Other connection			O
±0.5%				1							Accuracy
±1.0%				2
±1.5%				5
-58~292 °F (-50~100 °C) - standard					1						Temperature
-58~392 °F (-50~200 °C)-only for remote					2
ANSI 150#(2.5 Mpa)						1					Pressure
ANSI 300#(5.0 Mpa )						2
Other connection 其他						3
Compact Version, display，4-20Ma，RS485							CYS				Transmitter
Compact Version, display，4-20Ma，RS485，HART							CYH
Remote Version, display，4-20Ma，RS485							RYS
Remote Version, display分，4-20Ma，RS485，HART							RYH
Non-Explosion								NX			Approval
Exdib II CT3～T6 for transdurcer ,  Exd[ib] II CT6 transmitter								XI
Exdib II CT4～T6 for compact								XD
24VDC									DC		Power supply
85-260 VAC, 50 Hz									AC