Справочник Пользователя для Sierra Monitor Corporation 2-Wire Series

 

The Model 4501-XX Toxic Gas Sensor Module is a 2-wire transmitter with 4-20 mA output and it offers a broad 
array of features including: 

• 

2-wire loop powered 

• 

180 day calibration interval 

• 

Selectable ranges 

• 

Non-intrusive one-person calibration 

• 

Integral LCD  2-line, 20-character display 

• 

Stainless steel enclosure and sensor housing 

• 

4-20 mA output 

• 

Long sensor life 

• 

Rotatable faceplate enables multi-directional installation 
attitudes. 

The 4501-XX is designed and approved for installation and 
operation in hazardous locations.  

Members of the 4501-XX Two-Wire Toxic Gas family include: 

▪   4501-04 Carbon Monoxide Gas Sensor Module 

▪  4501-05 Hydrogen Sulfide Gas Sensor Module 

▪  4501-06 Chlorine Gas Sensor Module 

Various module mounting configurations can be implemented without special fixtures.  Where applicable, 
these options are factory configured prior to shipment.  Mounting configuration can be selected by the installer 
or field technician and are fully described in this manual.  

Electrochemical sensors are fuel cell-like devices consisting of an anode, cathode, and electrolyte.  The 
components of the cell are selected so a subject gas, allowed to diffuse into the cell, will cause a chemical 
reaction and generate a current.  The cells are diffusion limited so the rate the gas enters the cell is solely 
dependent on the gas concentration.  The current generated is proportional to the rate of consumption of the 
subject gas in the cell. 

Sierra Monitor electrochemical sensors provide improved reliability by allowing the gas to diffuse into the 
sensor through a capillary port, rather than diffusing through membranes.  The result is an extremely stable 
sensor with very low temperature and pressure coefficients and the capability to monitor gas as ppm.