​​Model 7500ZA

Non-Dispersive Infrared Analyzer



The 7500Z and 7600Z Series Infrared (IR) Analyzers are capable of detecting up to four chosen, individual IR absorbing components (i.e. CO, CO2, CH4, SO2, NO or NOX with external converter) on a continuous basis. Conveniently packaged in a 19” rack mount, the analyzer can also be supplied with an oxygen sensor, providing the operator with space saving, five in one, cost-effective design. The NEMA-4 enclosure can be purged to meet Class I, Div 1 (Zone 1) or Class I, Div 2 (Zone 2) hazardous area installation requirements.

Twin Detector

A high-sensitivity mass flow type twin detector is utilized for infrared measurements. By using a single beam, single path design in conjunction with a serial dual-layer transmission detector, the 7500Z Series delivers long-term, drift-free performance. The 7600Z Series achieves greater performance through an internal sample-switching system which serves to cancel zero drift.

Paramagnetic/Electrochemical Sensor

The oxygen concentration in the sample gas can be detected by either a built-in paramagnetic sensor or electrochemical sensor. The concentration of the desired gas is displayed on a large, easy-to-read back-lit LCD. The user interface is very intuitive and the menu/mode selection buttons, which are readily accessible, provide the operator with dynamic control and extensive diagnostic capabilities.

Available Analysis Gases and Ranges

​0-200 ppm to 0-5,000 ppm
​0-200 ppm to 0-10%
​0-100 ppm to 0-100%
​0-200 ppm to 0-100%
​0-500 ppm to 0-100%
​O2 (built in fuel cell)
​0-10% to 0-25%
​O2 (built in paramagnetic)
​0-5% to 0-100% / 95-100%


  • Steel case for indoor installation

  • Wetted materials: 304SS sample cell, chloroprene rubber seals

  • CaF2 optical windows, Tygon​/Teflon/Polypropylene tubing

  • 1/4"  NPT gas connections (1/4" RC optional)

  • 1 or 2 ranges per gas with auto-ranging and remote range selection (optional) capabilities

  • O2 correction calculation available

  • Integral auto-calibration and remote calibration functionality with solenoid valves to be provided by end user (integral auto-calibration valves available as an option)

  • Reading averaging capability available

  • Integral compensation for atmospheric pressure changes available

  • CE marked, conforms to Low Voltage Directive and EMI/RFI standards



​± 0.5% of full scale


​1% of full scale prior to atmospheric correction (option)


​Zero:    ± 2% of full scale/week
              In the case of Auto Zero calibration, use for 500 ppm or less range
Span:    ± 2% of full scale/week

​Response Time

​1-15 sec electrical response
Within 10-30 seconds including replacement time of sampling gas
Gas replacement depends on the number of measuring components and measuring range


​23° to 113°F (-5° to 45°C)


​Less than 1.5 PSIG, went to atmospheric pressure

​Sample Flow

​1.0 SCFH (0.5 SLPM)

​Utility Gases

​Not Required


​100-240 VAC, 50/60 Hz (100 VA Max)


​Rack Mount:    19"L x 5.22"H x 15.04"D
                           (48.3 x 13.3 x 38.2 cm)
                           Approximately 25 lbs (11.34 kg)

​Included I/O

​​4-20 mA (isolated) analog per measurement (or 0-1 VDC optional)
RS-485 MODBUS® RTU™ half-duplex serial communications
1 x system alarm, Form-C type, rated 1A / 24 VDC
1 x concentration alarms, Form-C type, rated 1A / 24 VDC
Range identification contact, Form-A type