Thermal flow meter VA 500

volumefor gasfor compressed air

Overview
Compressed air and gas consumption sensor VA 500 with display. Article VA 500 – consumption probe in base version: Standard (92.7 m/s), probe length 220 mm. Main order number (base probe): 0695 5001. Associated display: Z695 5000.

Product description
The VA 500 is a thermal mass flow sensor designed to measure flow in compressed air and various technical gases. The model with display integrates a screen for real-time display of volumetric flow (m3/h) and total volume (m3). The sensor can be used in pressurized installations, is suitable for mobile measurements and is intended for consumption monitoring and leak detection. The instrument offers standard digital interfaces (RS-485 Modbus-RTU) and several optional interfaces (Ethernet PoE, M-Bus).

Key measurement advantages

• Volumetric flow measurement; temperature measurement included
• RS-485 interface, Modbus-RTU standard
• Integrated display for m3/h and m3 (resettable counter)
• Usable from 1/2" to DN 1000
• Simple installation under pressure
• 4...20 mA analog output (for m3/h or l/min)
• Pulse output (1 pulse per m3 or per litre) galvanically isolated; pulse value adjustable
• Positive output for m3 or M-Bus (option)
• Inner diameter adjustable via buttons on the display
• Resettable consumption counter
• Configurable via the display keypad: reference conditions °C and mbar, 4...20 mA scaling, pulse value

Measurement ranges Flow VA 500 for compressed air (ISO 1217: 1000 mbar, 20°C)
Inner tube diameter – Values (Standard 92.7 m/s / Max 185.0 m/s / High Speed 224.0 m/s).
1/2" (16.1 mm, DN 15) — Standard: 759 l/min (26 cfm); Max: 1516 l/min (53 cfm); High Speed: 1836 l/min (64 cfm).
3/4" (21.7 mm, DN 20) — Standard: 89 m3/h (52 cfm); Max: 177 m3/h (104 cfm); High Speed: 215 m3/h (126 cfm).
1" (27.3 mm, DN 25) — Standard: 148 m3/h (86 cfm); Max: 294 m3/h (173 cfm); High Speed: 356 m3/h (210 cfm).
1 1/4" (36.0 mm, DN 32) — Standard: 266 m3/h (156 cfm); Max: 531 m3/h (312 cfm); High Speed: 643 m3/h (378 cfm).
1 1/2" (41.9 mm, DN 40) — Standard: 366 m3/h (215 cfm); Max: 732 m3/h (430 cfm); High Speed: 886 m3/h (521 cfm).
2" (53.1 mm, DN 50) — Standard: 600 m3/h (353 cfm); Max: 1197 m3/h (704 cfm); High Speed: 1450 m3/h (853 cfm).
2 1/2" (68.9 mm, DN 65) — Standard: 1028 m3/h (604 cfm); Max: 2051 m3/h (1207 cfm); High Speed: 2484 m3/h (1461 cfm).
3" (80.9 mm, DN 80) — Standard: 1424 m3/h (838 cfm); Max: 2842 m3/h (1672 cfm); High Speed: 3441 m3/h (2025 cfm).
4" (110.0 mm, DN 100) — Standard: 2644 m3/h (1556 cfm); Max: 5278 m3/h (3106 cfm); High Speed: 6391 m3/h (3761 cfm).
5" (133.7 mm, DN 125) — Standard: 3912 m3/h (2302 cfm); Max: 7808 m3/h (4594 cfm); High Speed: 9453 m3/h (5563 cfm).
6" (159.3 mm, DN 150) — Standard: 5560 m3/h (3272 cfm); Max: 11096 m3/h (6530 cfm); High Speed: 13436 m3/h (7907 cfm).
8" (200.0 mm, DN 200) — Standard: 8785 m3/h (5170 cfm); Max: 17533 m3/h (10318 cfm); High Speed: 21229 m3/h (12493 cfm).
10" (250.0 mm, DN 250) — Standard: 13744 m3/h (8088 cfm); Max: 27428 m3/h (16141 cfm); High Speed: 33211 m3/h (19544 cfm).
12" (300.0 mm, DN 300) — Standard: 19814 m3/h (11661 cfm); Max: 39544 m3/h (23271 cfm); High Speed: 47880 m3/h (28177 cfm).

Comparison of meters with and without display
The main difference is the presence of an integrated display on the version with display: real-time flow values, total volume and device-accessible settings. The version without display requires connection to an external display or monitoring system for data viewing and logging.

Characteristics / technical specifications

• Sensor type: thermal mass flow sensor
• Measured parameters: volumetric flow (m3/h, l/min, etc.), temperature
• Units adjustable via display keypad: m3/h, m3/min, L/min, L/s, ft/min, cfm, m/s, kg/h, kg/min, g/s, lb/min, lb/h
• Accuracy: ±1.5% of full scale ±0.3% of final value (on request: ±1% of full scale ±0.3% final value)
• Probe operating temperature: -30 ... 110 °C; housing: -20 ... +70 °C
• Operating pressure: -1 ... 50 bar (for pressure > 10 bar, high-pressure fuses optional)
• Digital outputs: RS-485 (Modbus-RTU) standard; options: Ethernet PoE, M-Bus
• Analog output: 4...20 mA for m3/h or l/min (configurable)
• Pulse output: 1 pulse per m3 or per litre, galvanically isolated; adjustable pulse value (can be used as alarm)
• Power supply: 18...36 VDC, 5 W
• Load (for 4...20 mA): < 500 Ω
• Housing: polycarbonate (IP65)
• Probe tube: stainless steel 1.4301, length 220 mm, Ø 10 mm
• Mounting thread: G 1/2"; option G 1/2" NPT (male thread)
• Housing Ø: 65 mm
• Mounting position: any