S4 PULSAR – NDIR Multi-gas analyser

The new PULSAR NDIR Multi-gas analyser from Signal Group has been upgraded to provide the company’s best ever performance specification. With ultra-low drift it is ideal for low range applications and high accuracy measurement. The unique design of the detector prevents cross-sensitivity to other gases and also removes the risk of contamination by particulate matter. As a result, this instrument is ideal for a wide range of industrial applications.

Optional Configuration

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Key Features

• Up to 5 channels

• Low ranges E.g. 0-10 ppm CO

• Fast speed of response

• 5 user-configurable ranges + autorange per channel

• Electronic pressure & temperature compensation

• RS232 ‘AK’ protocol, 4-20mA & 0-10VDC chart outputs

• Full ethernet remote diagnostics & control

• Free open-source remote software

• 24VDC or universal mains power supply

• Up to 23 x 1A contact closure outputs

Relevant standards: 

  • BS EN ISO 21258 
  • EN 14789 
  • EN 15058 
  • ISO 12039 
  • Ecodesign 
  • ARP1256D 


• Biological process monitoring 

• Agricultural emissions monitoring 

• Flue gas emissions monitoring 

• Continuous emissions monitoring (CEMs) 

• Combustion research 

• Combustion emissions monitoring 

• Combustion efficiency 

• Fuel cell analysis 

• Process control/monitoring 

• Landfill 

• Mining 

• Safety 

• Modified atmosphere packaging (MAP) 

• Vehicle emissions 

• Locomotive/automotive/marine combustion engine exhaust emissions 

• Biogas 

• Controlled atmosphere storage 

• Greenhouse gas (GHG) measurement  

• Carbon capture and storage (CCS) 

• Ethylene production 

• Gas turbine exhaust emissions  

• Direct Reduction Iron (DRI) process emission monitoring 

• Medical gas purity 

• Process emissions monitoring

• Gas Purity


➔ Datasheet

➔ Brochure

➔ User Manual

➔ Wireless Tablet User Manual

Technical Specification

CO: 0-100ppm to 0-100%
C02: 0-100ppm to 0-100%
CH4: 0-1000ppm to 0-100%
N2O: 0-1000ppm to 0-1%
SO2: 0-1000ppm to 0-1%


LINEARITY: 0.5 % of range or 1 % of reading

REPEATABILITY: 1 % of reading

ZERO DRIFT: 1 % FS per week

SPAN DRIFT: 1 % FS per 24 hrs

WARM UP TIME: Usable in 15 minutes, 1 hour to obtain specifications

FLOW SENSITIVITY: 1 % of range per l/min SAMPLE FILTER: 10 microns

OUTPUT SIGNAL: TCP/IP RS232/AK protocol 0.10 VDC

WATER (H20) INTERFERENCE: <1ppm/2ppm H2O typical

REMOTE OPERATION: Full suite of software running Window VB

SAMPLE TEMPERATURE: 5ºC – 40ºC Non-Condensing

POWER REQUIREMENTS: 110/220V 50/60 Hz 24VDC 70-350 Watts depending on number of channels

CONSTRUCTION MATERIALS: 316 Stainless steel PTFE Quartz Calcium Fluoride

SIZE: 19” x 133.5mm x 530 mm

WEIGHT: Max 23 Kg


• Servo controlled dumb bell detector Range 0-5 %, 0-10 %, 0-25%

• Accuracy +/- 0.01 % of reading

• Zero drift +/- 0.002 % O2 hour

• Tilt effect 0.01 % O2 degree

• Magnetic effect A mass of soft magnetic material placed anywhere on the enclosure will cause a change in reading of less than +/- 0.1% O2

• Detector noise Less than 0.005 % O2

• Linearity Better than 0.1 % O2

Optional Configurations

Gases & Cell Range: Specify gases to be measured and range of measurement you are looking at 

Carbon Monoxide (CO)
GFC CO AA (0-100ppm)  
GFC CO A (0-1000ppm) 
GFC CO B (0-10,000ppm)
GFC CO C (0-10%) 
GFC CO E (0-100%) 

Carbon Dioxide (CO2)
GFC CO2 AA (0-100ppm)  
GFC CO2 A (0-1000ppm) 
GFC CO2 B (0-10,000ppm)
GFC CO2 C (0-10%) 
GFC CO2 D (0-20%)  
GFC CO2 E (0-100%) 

Nitrous Oxide (N2O)
GFC N2O A (0-1000ppm)  
GFC N2O B (0-10,000ppm)   

Nitric Oxide (NO)
GFC NO A (0-1000ppm)  
GFC NO B (0-10,000ppm)   

Sulfur Dioxide (SO2)
GFC SO2 A (0-1000ppm)  
GFC SO2 B (0-10,000ppm) 
GFC SO2 C (0-10%) 

Methane (CH4)
GFC CH4 A (0-1000ppm)  
GFC CH4 B (0-10,000ppm) 
GFC CH4 E (0-100%) 

Hydrogen Chloride (HCL)
GFC HCL A (0-1000ppm)  
GFC HCL B (0-10,000ppm)    

Oxygen (O2)

Front Panel:
Removable Wireless Tablet 

Gas Handling*
Basic Single Inlet (Standard – FOC)
Calibration Gas Handling
Full Gas Handling 

Output*   (Analogue outputs are either 0-10VDC or 4-20mA)
0-10VDC (Standard)
4-20mA (optional at extra cost)
Upgraded chart output (20 additional alarms) 

MI/995 – Analogue Output SCSI Cable (optional at extra cost)



– Blank Panel is provided with free issued S4i software to act as remote display and to automate coarse and fine calibration. Display: Removable wireless tablet with on-board logging facility. 

– Internal Gas Handling: Basic option is single inlet for all sample and calibration gases. The following options are available as upgrades: 

* Calibration Gas Handling: Single sample inlet. Separate solenoid-controlled calibration gas inlets. 

* Full Gas Handling: Separate inlets for all samples and calibration gases. Fully solenoid controlled via analyser software. 

– The standard I/O includes 3 contact closure alarm outputs. This upgraded option has 23 user configurable contact closure that can be used for alarms or to control external functions such as down-the-line calibration.