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Fast Response, High-Performance, Smart Insertion Gas Mass Flow Meter
Features
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Fast response flow meter ideal for gas mass flow measurement applications Smart electronics permit field adjustment of critical flow meter settings Field validation of flow meter calibration 200 millisecond response to changes in flow rate Outstanding rangeability Optional 2 x 12 backlit LCD display Minimal flowblockage and low pressure drop CE approved

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620S Series Fast-Flo™

Description

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S

ierra Instruments’ Series 620S Smart Insertion Mass Flow Meter provides an economical solution for

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gas flow measurement applications. The meter’s sensor offers long-term reliability and 200 millisecond response to changes in flow rate. The versatile microprocessor-based transmitterintegrates the functions of flow-range adjustment, meter validation and diagnostics in a probe-mounted NEMA 4X (IP65) housing. Mass flow rate and totalized flow, as well as other configuration variables, can be displayed on the meter’s optional 2 x 12 backlit LCD panel. The meter also provides an optical/galvanic isolated 4-20 mA output and two alarm outputs. The programmable transmitter iseasily configured via RS 232 and Sierra’s Smart Interface™ Windows™-based software or three push buttons in the device. The Series 620S is suitable for pipes or ducts from two inches to 48 inches (DN50 to DN1200).

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5 Harris Court, Bldg. L Monterey CA 93940 831/373-0200 800/866-0200 FAX: 831/373-4402 www.sierrainstruments.com

The information contained herein is subject to change withoutnotice.

Dimensional Specifications NEMA 4X — Side View (EN2)
0.90 (22.9) 1.97 (50.0) 2.38 (60.5)

Tables NEMA 4X — Front View (EN2)
0.70 (17.8) 3.93 (99.8)

Length Chart Code L04
3.93 (99.8)

L 4.0 (101.6) 6.0 (152.4) 9.0 (228.6) 13.0 (330.2) 18.0 (457.2) 24.0 (609.6)

L06 L09

1/2-inch NPT

0.55 (14.0) L

L13 L18

0.275 (7.0)

0.375 (9.5)

L24

NEMA 4X with Junction Box —Side View (EN4)
2.38 (60.5)

NEMA 4X with Junction Box—Front View (EN4)
0.70 (17.8) 3.93 (99.8)

.90 (22.9) 2.46 (62.5)

.05 (1.3)

3.93 (99.8)

C L

1/2-inch NPT

L

0.55 (14.0)

Per Customer Cable Length Requirement, 100 Feet Maximum

0.275 (7.0)

0.375 (9.5)

All dimensions are inches. Millimeters are in parentheses . Certified drawings are available on request.Performance Specifications Accuracy of Point Velocity ± 1% of full scale Repeatability ± 0.2% of full scale Temperature Coefficient ± 0.02% of reading per °F within ± 50°F of customer specified conditions ± 0.03% of reading per °F within ± 50°F to 100°F of customer specified conditions ± 0.04% of reading per °C within ± 25°C of customer specified conditions ± 0.06% of reading per °C within ± 25°C to50°C of customer specified conditions Pressure Coefficient .02% per psi for air, consult factory for other gases Response Time 200 milliseconds to 63% of final velocity value Operating Specifications Gases Most non-corrosive gases Gas Pressure 120 psig (8 barg) maximum design pressure Pressure Drop Negligible Gas & Ambient Temperature Gas . . . . . . . . . . . . . . 14° to 176°F (-10° to 80°C)Ambient . . . . . . . . . . 32° to 120°F (0° to 50°C) Power Requirements 18 to 30 VDC (regulated), 625 mA maximum Output Signal Linear 0–5 VDC or 0-10 VDC, 1000 ohms minimum load resistance or Linear 4–20 mA proportional to mass flow rate, 700 ohms maximum resistance power supply dependent User-selectable. Active non-galvanically separated or passive galvanically separated (loop power required)Operating Specifications (cont.) Alarms Hard contact user-adjustable high and low Dead band adjustable with Smart Interface™ software Relay ratings . . . . . . . Maximum 42 VAC or 42 VDC, 140 mA Displays Alphanumeric 2 x 12 digit backlit LCD Adjustable variables via on-board switches (password protected) or with Smart Interface™ software Adjustable variables. . Full scale (50 to 100 %) Time...