Detcon MicroSafe™
Model DM-534C
Oxygen Deficiency Sensor (0-25% O2)
Operator’s Installation and Instruction Manual
4055 Technology Forest Blvd, Suite 100,
The Woodlands, Texas 77381
Ph.281.367.4100 / Fax 281.298.2868
February 21,2012 • Document #2405 • Revision 1.4
DETCON, Inc.
www.detcon.com
DM-534C Oxygen Sensor Assembly
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DM-534C O2 Sensor Instruction Manual ii
DM-534C Oxygen Sensor Assembly
Table of Contents
1.0
DESCRIPTION........................................................................................................................................ 1
1.1 Sensor Technology............................................................................................................................... 1
1.2 Base Connector Board..........................................................................................................................2
1.3 Explosion Proof Enclosure................................................................................................................... 2
2.0 PRINCIPLE OF OPERATION.............................................................................................................. 3
3.0 APPLICATION .......................................................................................................................................3
3.1 Sensor Placement/Mounting................................................................................................................. 3
3.2 Interference Data.................................................................................................................................. 4
4.0 SPECIFICATIONS ................................................................................................................................. 4
5.0 OPERATING SOFTWARE ................................................................................................................... 4
5.1 Normal Operation................................................................................................................................. 5
5.2 Calibration Mode.................................................................................................................................. 5
5.3 Program Mode...................................................................................................................................... 5
5.3.1 Program Status............................................................................................................................. 5
5.3.2 Calibration Level Adjustment....................................................................................................... 5
6.0 INSTALLATION..................................................................................................................................... 5
6.1 Field Wiring Table (4-20 mA output).................................................................................................. 5
6.2 Sensor Location.................................................................................................................................... 6
6.3 Local Electrical Codes.......................................................................................................................... 7
6.4 Accessibility......................................................................................................................................... 7
6.5 Installation Procedure...........................................................................................................................7
6.6 Remote Mounting Applications ........................................................................................................... 8
7.0 START UP................................................................................................................................................ 9
8.0 CALIBRATION..................................................................................................................................... 10
8.1 Calibration Procedure - Span ................................................................................................... .......... 11
8.2 Additional Notes................................................................................................................................. 12
8.3 Calibration Frequency........................................................................................................................ 12
8.4 Calibration Gas Level......................................................................................................................... 12
8.5 Status of Programming and Sensor Life............................................................................................. 13
8.6 Program Features................................................................................................................................ 13
8.7 Display Contrast Adjust ..................................................................................................................... 14
9.0 TROUBLE SHOOTING....................................................................................................................... 15
10.0 SPARE PARTS LIST............................................................................................................................ 16
11.0 WARRANTY......................................................................................................................................... 17
12.0 SERVICE POLICY............................................................................................................................... 17
Appendix C....................................................................................................................................................... 18
Revision History............................................................................................................................................. 18
Table of Figures
Figure 1 Construction of Galvanic Cell ............................................................................................................ 1
Figure 2 Microprocessor Control Circuit..........................................................................................................1
Figure 3 Base connector board..........................................................................................................................2
DM-534C O2 Sensor Instruction Manual iii
DM-534C Oxygen Sensor Assembly
Figure 4 Explosion proof enclosures................................................................................................................. 3
Figure 5 Functional Block Diagram..................................................................................................................3
Figure 6 Typical Installation .............................................................................................................................7
Figure 7 Typical Outline and Mounting Dimensions........................................................................................ 8
Figure 8 Sensor Connector PCB .......................................................................................................................8
Figure 9 Remote mounting application.............................................................................................................9
Figure 10 Magnetic Programming Tool............................................................................................................10
Figure 11 Spare parts diagram...........................................................................................................................16
List of Tables
Table 1 Interference Data..................................................................................................................................4
Table 2 Field wiring Table..............................................................................................................................5
Shipping Address: 4055 technology Forest Blvd, Suite 100., The Woodlands Texas 77381
Phone: 888.367.4286, 281.367.4100 • Fax: 281.292.286 0 •
DM-534C O2 Sensor Instruction Manual iv
Mailing Address: P.O. Box 8067, The Woodlands Texas 77387-8067
www.detcon.com • sales@detcon.com
DM-534C Oxygen Sensor Assembly
1.0 DESCRIPTION
Detcon MicroSafe™ Model DM534C, oxygen deficiency sensors are non-intrusive “Smart” sensors designed
to detect and monitor O2 in air over the range of 0-25%. One of the primary features of the sensor is its
method of automatic calibration which guides the user through each step via instructions displayed on the
backlit LCD. The sensor output is a standard 4-20 mA signal. The microprocessor-supervised electronics are
packaged as a plug-in module that mates to a standard connector board. Both are housed in an explosion proof
condulet that includes a glass lens. A 16 character alpha-numeric indicator is used to display sensor readings as
well as the sensor’s menu driven features via a handheld programming magnet.
1.1 Sensor Technology
The sensor technology is of the two-electrode, galvanic metal air battery type cell, which is housed as a field
replaceable plug–in module. The cell is diffusion limited and functions as a direct current generator
proportional to the amount of oxygen adsorption. The sensors are temperature compensated and show good
accuracy and stability over the operating temperature range -4° to +122° Fahrenheit. The sensor is warranted
for two years and has an expected service life of up to three years in ambient air at 20.9% oxygen.
Figure 1 Construction of Galvanic Cell
The control circuit is microprocessor based and is packaged as a plug-in field replaceable module, facilitating
easy replacement and minimum down time. Circuit functions include a basic sensor preamplifier, onboard
power supplies, microprocessor, back lit alpha numeric display, calibration and fault status LED indicators,
magnetic programming switches, and a linear 4-20 mA DC output.
Figure 2 Microprocessor Control Circuit
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DM-534C Oxygen Sensor Assembly
1.2 Base Connector Board
The base connector board is mounted in the explosion proof enclosure and includes: the mating connector for
the control circuit, reverse input and secondary transient suppression, input filter, and lugless terminals for
field wiring.
Wiring to
Customer
Wiring
O2 Sensor
Figure 3 Base connector board
1.3 Explosion Proof Enclosure
The sensors are packaged in a cast metal explosion proof enclosure. The enclosure is fitted with a threaded
cover that has a glass lens window. Magnetic program switches located behind the transmitter module face
plate are activated through the lens window via a handheld magnetic programming tool allowing non-intrusive
operator interface with the sensor. Calibration can be accomplished without removing the cover or
declassifying the area. Electrical classification is Class I; Groups B, C, D; Division 1.
DM-534C O2 Sensor Instruction Manual Rev.1.4 Page 2 of 18
DM-534C Oxygen Sensor Assembly
Figure 4 Explosion proof enclosures
2.0 PRINCIPLE OF OPERATION
Method of detection is by a controlled rate of diffusion. Air and gas diffuse through a sintered stainless steel
filter and a diffusion barrier. As oxygen is adsorbed into the electrolyte solution a current is generated between
the cathode and anode electrodes. This current output rises with increases in oxygen concentration and
reverses with lower concentrations. The quick response of the cell results in continuous monitoring of ambient
air conditions.
Figure 5 Functional Block Diagram
3.0 APPLICATION
Model DM-534C MicroSafe™ sensors are designed to detect and monitor oxygen deficiency in ambient air in
the range of 0-25%. Minimum sensitivity and scale resolution is 0.1%. Operating temperature range is -4° F. to
+122° F. While the sensor is capable of operating outside these temperatures, performance specifications are
verified within the limit.
3.1 Sensor Placement/Mounting
Sensor location should be reviewed by facility engineering and safety personnel. Area leak sources and
perimeter mounting are typically used to determine number and location of sensors. The sensors are generally
located 2-4 feet above grade.
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