Instruction manual
SM425 INSTRUCTION MANUAL    2.0 SPECIFICATIONS 
12 42500001 REV A 
2.3 High-Temperature Separate-type Detector and Related 
Equipment 
2.3.1 SM425P (0.15m) High-Temperature Separate-type Detector 
Standard Specifications 
Construction: 
Water-resistant, non-explosion proof 
Probe length: 
0.15 m 
Terminal box: 
Aluminum alloy 
Probe material: 
Probe material in contact with gas: SUS 316 (JIS) (Probe), SUS 304 (JIS) (Flange), Zirconia 
(Sensor), Hastelloy B, (Inconel 600, 601) 
Weight: 
Approx. 3 kg 
Installation: 
Flange mounting (The use of high-temperature detector probe adapter ZO21P-H is necessary.) 
Flange standard: 
JIS 5 K 32 FF equivalent (thickness varies) 
Mounting angle: 
Any angle between the horizontal and vertical (high-temperature probe is fitted with an adapter) 
Reference gas and calibration gas piping connection: Rc 1/4 or 1/4 NPT female 
Cable inlet: 
G 1/2, Pg 13.5, M20 3 15, 1/2 NPT 
Ambient temperature: 
-20 to 150°C 
Sample gas temperature: 
0 to 700°C (temperature at the measuring point of the sampling gas), 0 to 750°C, or 0 to 1400°C 
when the probe adapter for high temperature is used. 
Temperature of the probe adapter shall not exceed 300°C to protect the gasket and avoid the 
bolts seizing together. 
Sample gas pressure: 
- 0.5 to + 5 kPa: when used at the range of more than 0 to 25 vol% O
2
, - 0.5 to + 0.5 kPa. (An 
auxiliary ejector is required for negative pressure application.) 
Model and Code 
Refer to “Model and Code” in 










