Microprocessor Control

Advanced Gas Analyzers

2-Year Warranty


The SIGNAL Instruments Model 521 Total Hydrocarbon Analyzer is designed for the measurement of gaseous hydrocarbons or volatile organic compounds in ambient air, special process or environmental applications.


gas analyzers


paramagnetic oxygen
Flame Ionization Analyzer Model 521

The Model 521 relies on the the flame ionization principle of hydrocarbon gas measurement and features a highly sensitive detector and extremely wide dynamic range.


This analog electronic, ambient level hydrocarbon monitor features high sensitivity, fast response, excellent stability, wide dynamic range and low maintenance.
A large digital LCD provides a clear display of total hydrocarbon concentration measurement. Analog gauges are provided for hydrogen fuel, air and sample gas pressure monitoring. A flowmeter is provided on the front panel to monitor bypass sample gas flow. The unit features 19" rack mounting at 5RU height and a typical configured weight of 45 Lb.



Model 521 Hydrocarbon Analyzer Specifications:


paramagnetic o2


Detector Type: Flame Ionization Detector, temperature-controlled at 80 degrees C.

Ranges: Standard: 0-10/25/100/250/1000/2500/10000, optional ranges with auto-ranging available

Response Time: 1.5s (T5 to T95)

Sample Gas Requirements: 1.0 to 3.0 lpm, non-condensing

Fuel: 100% Hydrogen, 50ml/min

Air Supply: Zero Grade, 300ml/min. Compatable with the AS80 Zero Air Supply.

Accuracy and Repeatability: +/- 1.0% of F.S.

Detector (FID) Noise: <0.25% at zero

Linearity: < +/- 1.0%

Output: 0-1VDC, optional voltages and 4-20mA available

Alarms: Two configurable hydrocarbon concentration alarms available as option

Environment: Temperature: 5-30 degrees C, 95%RH, non-condensing.

Dim: 19" rack-mount, 3RU (133.5mm) height, 525mm depth, 25Kg weight.

Warranty: 2 Years

Optional Features:

Alternative ranges and application specific configuration

Built-in sample pump

Current output, 0-20mA of 4-20mA, alternate voltage outputs

Dual level alarms with independently settable SPDT contacts

Automatic Range Change

Automatic Ignition, auto choke

Bench mount case

H2/He fuel




355 North York Rd.
Willow Grove, PA 19090
Tel: 215.830.8882
Fax: 215.830.8922
email: sales@k2bw.com
Hours of operation:
M-F 8AM to 6PM
weekends and 24-hour emergercy service by agreement
© 1996-2013 K2BW All Rights Reserved