SD/LD-450 is a high performance oxygen analyzer developed for various devices such as vacuum devices on the basis of our longtime reliability and performance in the electronics market.
SD/LD-450 is more durable than ever because our own compact zirconia sensor, by which the long-term stable and precise measurement is available, and oxygen sensor protection mechanism are mounted. In addition, SD/LD-450 can be set to more suitable measurement place by separating oxygen sensor from converter and making the converter wall mounting type. This is the best oxygen analyzer for building into various treatment devices with easy operation.


♦ Setup layout is flexible.
The separated structure of oxygen sensor and thin converter greatly relaxed the limit of installation location.
♦ Space saving
New developed thin wall mounting type converter resolved the concerns about depth.
♦ Super high speed response
The shortest response can be achieved by separated sensor.
♦ High durable sensor
The sensor with special coating realized high durability.
♦ Compliant standard
Compliant with CE marking, EN61010-1, EN61326-1, and RoHS

Measurement Principle

Toray zirconia oxygen analyzers determine oxygen concentration using the conductivity of a zirconia ceramic cell. Zirconia ceramic cells only allow oxygen ions to pass through at high temperatures. With reference gas on one side and sample gas on the other, oxygen ions move from the side with the highest concentration of oxygen to that with the lowest concentration. The movement of ions generates an Electro Motive Force, which can be measured to determine the oxygen content. This is in accordance with the so-called Nernst Equation.

Example of installation (The connection between SD sensor and converter LD-450 is 1:1.)

Example of installation


Equipment Specifications

Type Separation Type (Converter : Wall mounting type, Sensor : Direct insert type)
Display LED Digital 3 Digits + Unit (%)
Auto Range(Concentration Display) : LED Digital 4 Digits (Display Operation/Setting Content) 0.001ppm - 100vol%O2
Measurement Range 0-1/10/100/1000ppm/1/10/100%
Sensor Connection ISO Vacuum Flange NW16,25,40
or R3/8 screw
Reference Gas Atmospheric Gas
Weight Converter Approx. 1.2kg
Sensor  Approx. 0.5kg
Color LD-450 : Mat White Sensor : Paintless
Dimension 85W × 155H × 40D mm (excluding protrusion)


Repeatability ±0.5%FS (1% range or more)
±1.0%F.S or ±0.1ppm whichever is bigger (Less than 1% range)
Air Point Stability ±1%FS or less / 24hr

*Please confer with us separately for any request other than above specifications.

Engineering Specification

Measurement value Output LD-450T : DC4 - 20mA
LD-450C : RS-232C
Recorder Output Range Select 0-1%, 0-5%, 0-10%, 0-25% or 0-100%
Concentration Alarm Output H/L
LD-450T:2 points non-voltage contact output
LD-450C : Transmission Output
Equipment Error Output LD-450T : 1 point non-voltage output
LD-450C : Transmission Output
Sample Gas Condition No Combustible/Corroded Component, No Halogen, No Silica, No Waterdrop
Pressure: Atmosphere - 1 × 10-3Pa
Flow : 500 - 2000ml/min
Humidity: Dew point below ambient temperature
Power Source Voltage : DC24V±10%
Installation Condition Location : Indoors, Non Explosion Area
Ambient Temperature : 0 - 40°C
Ambient Humidity : 45 - 85%RH
Warm-up Time 6 min. or less

SD/LD-450 Specifications

Oxygen Analyzers
High/Medium Concentration Measurement Type LC-750H
Clean Gas Sampling Equipment Built-in Type LC-750H/PC-110
Dirty Gas Sampling Equipment Built-in Type LC-750H/PC-111
Medium/Low Concentration Measurement Type LC-750L
Clean Gas Sampling Equipment Built-in Type LC-750L/PC-120
Research/Experimental Use High Performance Type LC-850K, KS, KD
Research/Experimental Use High Performance Type LC-860
General-Purpose Type LC-300
Low Concentration Measurement General-Purpose Type LC-450D
Low Concentration Measurement General-Purpose Type LC-450A
Baking and N2 Reflow Use Analyzer RF-30
Baking and N2 Reflow Use RF-400
Separate Sensor Type vacuum deposition SW/LD-300
Oxygen Analyzer for Food Packaging LC-450F
Gas Flush Packaging Sampling Inspection Type LC-750F
Oxygen Analyzer for Built-in Packing Machine LF-200
Combustion Management Application Type SE-740/SE-740D
Relevant web pages
Principle of Measurement of Zirconia Oxygen Analyzers
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