Detcon Model Series
DM-500IS OLED
Explosion Proof and Intrinsically Safe Toxic Gas Sensors
Operator’s Installation and Instruction Manual
DETCON, Inc.
4055 Technology Forest Blvd. Suite 100,
The Woodlands, Texas 77381
Ph.281.367.4100 / Fax 281.298.2868
www.detcon.com
August 17, 2015 • Document #4517 • Revision 0.1
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DM-500IS
DM-500IS Instruction Manual ii
DM-500IS
Table of Contents
1.0 Description................................................................................................................................................ 2
1.1 Sensor Technology............................................................................................................................... 2
1.2 Universal Microprocessor Control Transmitter Circuit........................................................................ 3
1.3 Base Connector Board.......................................................................................................................... 3
1.4 Explosion Proof Enclosure................................................................................................................... 3
2.0 Principle Of Operation............................................................................................................................ 4
3.0 Application............................................................................................................................................... 5
3.1 Sensor Placement/Mounting................................................................................................................. 5
3.2 Interference Data.................................................................................................................................. 5
3.3 Interference Gas List ............................................................................................................................ 6
3.4 Interference Gas Table (page 1 of 5)....................................................................................................7
4.0 Specifications.......................................................................................................................................... 12
5.0 Installation.............................................................................................................................................. 13
5.1 Field Wiring Table (4-20 mA output) ................................................................................................ 13
5.2 Sensor Location.................................................................................................................................. 13
5.3 Local Electrical Codes........................................................................................................................ 15
5.4 Installation Procedure......................................................................................................................... 15
5.5 Remote Mounting Applications ......................................................................................................... 16
6.0 Startup.................................................................................................................................................... 17
6.1 Initial Operational Tests ..................................................................................................................... 17
7.0 Operating Software & Magnetic Interface.......................................................................................... 18
7.1 Normal Operation............................................................................................................................... 18
7.2 Calibration Mode................................................................................................................................ 18
7.2.1 Zero Adjustment ......................................................................................................................... 18
7.2.2 Span Adjustment......................................................................................................................... 18
7.3 Program Mode.................................................................................................................................... 18
7.3.1 Program Status........................................................................................................................... 18
7.3.2 Calibration Level Adjustment..................................................................................................... 18
7.4 Programming Magnet Operating Instructions.................................................................................... 19
8.0 Software Flow Chart ............................................................................................................................. 20
9.0 Calibration.............................................................................................................................................. 20
9.1 Calibration Procedure – Zero ............................................................................................................. 20
9.2 Calibration Procedure – Span............................................................................................................. 21
9.3 Additional Notes................................................................................................................................. 22
9.4 Calibration Frequency........................................................................................................................ 22
10.0 Status of Programming, Calibration Level and Sensor Life.............................................................. 22
11.0 Program Features.................................................................................................................................. 23
12.0 Universal Transmitter Feature (Re-Initialization)............................................................................. 24
13.0 Trouble Shooting ................................................................................................................................... 25
14.0 Spare Parts List...................................................................................................................................... 27
15.0 Warranty................................................................................................................................................ 29
16.0 Service Policy ......................................................................................................................................... 29
DM-500IS Instruction Manual iii
DM-500IS
17.0 Revision History..................................................................................................................................... 30
Table of Figures
Figure 1 DM-500IS Sensor ...............................................................................................................................2
Figure 2 Construction of Electrochemical Sensor.............................................................................................2
Figure 3 Universal Microprocessor Control Transmitter circuit.......................................................................3
Figure 4 Base connector board..........................................................................................................................3
Figure 5 Explosion-Proof Enclosure .................................................................................................................4
Figure 6 Functional Block Diagram..................................................................................................................4
Figure 7 Typical Installation .............................................................................................................................14
Figure 8 Typical Outline and Mounting Dimensions........................................................................................15
Figure 9 Sensor wiring......................................................................................................................................16
Figure 10 Remote wiring diagram.....................................................................................................................16
Figure 11 Programming magnet........................................................................................................................ 19
Figure 12 Programming Switch locations.........................................................................................................19
Figure 13 Software Flow Chart.........................................................................................................................20
Figure 14 Spare parts diagram...........................................................................................................................27
List of Tables
Table 1 Model #, Gas Name and Symbol..........................................................................................................1
Table 2 Sensor cell specifications.....................................................................................................................12
Table 3 Field wiring Table................................................................................................................................13
Table 4 Over-current Protection per AWG .......................................................................................................13
Table 5 IS Sensor Head / Plug-in Replacement Sensor Cell............................................................................. 28
Shipping Address 4055 Technology ForestBlvd. Suite100,., TheWoodlands Texas 77381
Phone: 888.367.4286, 281.367.4100 • Fax:281.292.2860• www.detcon.com• sales@detcon.com
DM-500IS Instruction Manual iv
Mailing Address: P.O. Box 8067, The Woodlands Texas77387-8067
This manual covers the following Models...
Table 1 Model #, Gas Name and Symbol
Model # Gas Name Symbol
DM-500-C2H3O Acetaldehyde C2H3O
DM-500-C2H2 Acetylene C2H2
DM-500-C3H3N Acrylonitrile C3H3N
DM-500-NH3 (-20°C) Ammonia NH3
DM-501-NH3 (-40°C) Ammonia NH3
DM-502-NH3 Ammonia (continuous exposure) NH3
DM-500-AsH3 Arsine AsH3
DM-500-Br2 Bromine Br2
DM-500-C4H6 Butadiene C4H6
DM-500-CS2 Carbon Disulfide CS2
DM-500-CO Carbon Monoxide CO
DM-500-COS Carbonyl Sulfide COS
DM-500-CL2 Chlorine CL2
DM-500-CLO2 Chlorine Dioxide (>50 ppm range) CLO2
DM-501-CLO2 Chlorine Dioxide (≤50 ppm range) CLO2
DM-500-B2H6 Diborane B2H6
DM-500-C2H6S Dimethyl Sulfide C2H6S
DM-500-C3H5OCL Epichlorohydrin C3H5OCL
DM-500-C2H5OH Ethanol C2H5OH
DM-500-C2H5SH Ethyl Mercaptan C2H5SH
DM-500-C2H4 Ethylene C2H4
DM-500-C2H4O Ethylene Oxide C2H4O
DM-500-F2 Fluorine F2
DM-500-CH2O Formaldehyde CH2O
DM-500-GeH4 Germane GeH4
DM-500-N2H4 Hydrazine N2H4
DM-500-H2 Hydrogen (ppm range) H2
DM-501-H2 Hydrogen (% LEL range) H2
DM-500-HBr Hydrogen Bromide HBr
DM-500-HCL Hydrogen Chloride HCL
DM-500-HCN Hydrogen Cyanide HCN
DM-500-HF Hydrogen Fluoride HF
DM-500-H2S Hydrogen Sulfide H2S
DM-500-CH3OH Methanol CH3OH
DM-500-CH3SH Methyl Mercaptan CH3SH
DM-500-NO Nitric Oxide NO
DM-500-NO2 Nitrogen Dioxide NO2
DM-500-O3 Ozone O3
DM-500-COCL2 Phosgene COCL2
DM-500-PH3 Phosphine PH3
DM-500-SiH4 Silane SiH4
DM-500-SO2 Sulfur Dioxide SO2
DM-500-C4H8S Tetrahydrothiophene C4H8S
DM-500-C4H4S Thiophane C4H4S
DM-500-C6H5CH3 Toluene C6H5CH3
DM-500-C4H6O2 Vinyl Acetate C4H6O2
DM-500-C2H3CL Vinyl Chloride C2H3CL
DM-500IS
DM-500IS Instruction Manual Rev 0.1 Page 1 of 30
DM-500IS
1.0 Description
Detcon MicroSafeTM Model DM-500IS, toxic sensors are non-intrusive “Smart” sensors designed to detect
and monitor for toxic gas in the ppm range. 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 OLED Display
The sensor features LED indicators for FAULT and CAL status and is equipped with a standard analog 4-20
mA output. The microprocessor supervised electronics are packaged as a universal plug-in transmitter 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 hand-held programming magnet.
Figure 1 DM-500IS Sensor
Typical ranges of detection are 0-10ppm, 0-25ppm, 0-50ppm and 0-100ppm. Other ranges are available and all
ranges are covered by this manual. To determine sensor model number, reference the label located on the
enclosure cover. To determine gas type and range, reference labeling on the intrinsically safe sensor head.
1.1 Sensor Technology
The sensors are electrolytic chemical cells. Each cell consists of three electrodes embedded in an electrolyte
solution all housed beneath a diffusion membrane. Sensitivity to specific target gases is achieved by varying
composition of any combination of the sensor components. Good specificity is achieved in each sensor type.
The cells are diffusion limited via small capillary barriers resulting in long service life of up to 3 or more
years. The fuel cell is packaged as a field replaceable plug-in sensor via gold plated pins. Pre-amplifier and
intrinsically safe barrier circuits are epoxy potted in the stainless steel housing and include the mating sockets
for the sensor.
Figure 2 Construction of Electrochemical Sensor
DM-500IS Instruction Manual Rev 0.1 Page 2 of 30
DM-500IS
1.2 Universal Microprocessor Control Transmitter Circuit
The control circuit is microprocessor based and is packaged as a universal plug-in field replaceable module,
facilitating easy replacement and minimum down time. The universality includes the ability to set it for any
range concentration and for any gas type. These gas and range settings must be consistent with the IS Sensor
Head it is mated with. Circuit functions include a basic sensor pre-amplifier, on-board power supplies,
microprocessor, back lit alpha numeric display, fault and calibration status LED indicators, magnetic
programming switches, and a linear 4-20 mA DC output.
Figure 3 Universal Microprocessor Control Transmitter circuit
1.3 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 all
field wiring.
Figure 4 Base connector board
1.4 Explosion Proof Enclosure
The transmitter electronics 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 hand-held 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 (explosion proof).
DM-500IS Instruction Manual Rev 0.1 Page 3 of 30
DM-500IS
The sensor housing section employs an Intrinsically Safe Barrier circuit which allows for the safe usage of
plastic housing materials in the lower section. This design benefit avoids the requirement for stainless steel
flame arrestors which reduce the sensitivity and response time to “active” gas species such as NH3, CL2,
CLO2, and HCL...etc.
Transmitter Electronics in
Explosion-Proof Housing
Intrinsically Safe
Sensor Head
Figure 5 Explosion-Proof Enclosure
2.0 Principle Of Operation
Method of detection is by an electrochemical reaction at the surface of an electrode called the sensing
electrode. Air and gas diffuse through the capillary diffusion barrier. The controlling circuit maintains a small
external operating voltage between the sensing and counter electrodes of the proper bias and magnitude so that
no current flows to or from the reference electrode while its potential is maintained at the correct fixed voltage
- usually ground. The electrochemical reaction creates a change in current flow from the counter electrode to
the sensing electrode. This change in current is proportional to the gas concentration and is reversible. The
quick response of the sensor results in continuous monitoring of ambient air conditions. The Intrinsically Safe
Sensor Housing design allows direct contact of the target gas to the electrochemical sensor, thus maximizing
response time, detectability and repeatability.
Figure 6 Functional Block Diagram
DM-500IS Instruction Manual Rev 0.1 Page 4 of 30
DM-500IS
NOTE
3.0 Application
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.
3.2 Interference Data
Detcon Model DM-500IS series electrochemical sensors are subject to interference from other gases. This
interaction is shown in the table in section 3.4 as the relation between the amount of the interfering gas applied
to the sensor, and the corresponding reading that will occur. All measurements are in ppm unless otherwise
noted.
The table is laid out with the Model Number of each sensor in a column on the left side of the page. The
interfering gases are listed in a row across the top of the page. Each page lists all Model Numbers but 5 pages
are necessary to list all interfering gases, thus each page is a repeat of the full line of Detcon sensors. Be sure
to reference each page to ascertain the full listing of interfering gases for a particular sensor.
As an example, the first listing shows that the Model DM-500IS-C2H30 acetaldehyde sensor will have an
interference reading of 340 ppm if 40 ppm of C2H2 (Acetylene) is applied.
: Interference factors may differ from sensor to sensor and with life time. It is not
advisable to calibrate with interference gases. They should be used as a guide only
DM-500IS Instruction Manual Rev 0.1 Page 5 of 30
3.3 Interference Gas List
Gas Name
Symbol
Gas Name
Symbol
Acetaldehyde C2H3O Hydrocarbons C-H’s
Acetylene C2H2 Hydrocarbons (unsaturated) C-H’s (u)
Acrylonitrile C3H3N Hydrogen H2
Alcohols Alcohols Hydrogen Bromide HBr
Amines Amines Hydrogen Chloride HCL
Ammonia NH3 Hydrogen Cyanide HCN
Arsenic Trifluoride AsF3 Hydrogen Fluoride HF
Arsenic Pentafluoride AsF5 Hydrogen Selenide HSe
Arsine AsH3 Hydrogen Sulfide H2S
Boron Trifluoride BF3 Iodine I2
Bromine Br2 Isopropanol C3H8O
Butadiene C4H6 Methane CH4
Buten-1 Buten-1 Methanol CH3OH
Carbon Dioxide CO2 Methyl-Ethyl-Ketone C4H8O
Carbon Disulfide CS2 Methyl Mercaptan CH3SH
Carbon Oxide Sulfide COS Nitric Oxide NO
Carbon Monoxide CO Nitrogen N2
Carbonyl Sulfide COS Nitrogen Dioxide NO2
Chlorine CL2 Ozone O3
Chlorine Dioxide CLO2 Phosgene COCL2
Chlorine Trifluoride CLF3 Phosphine PH3
Diborane B2H6 Phosphorous Trifluoride PF3
Dimethyl Sulfide C2H6S Silane SiH4
Disilane Si2H6 Silicon Si
Epichlorohydrin C3H5OCL Silicon Tetra Fluoride SiF4
Ethanol C2H5OH Sulfur Dioxide SO2
Ethyl Mercaptan C2H5SH Tetrahydrothiophene C4H8S
Ethylene C2H4 Thiophane C4H4S
Ethylene Oxide C2H4O Toluene C6H5CH3
Fluorine F2 Tungsten Hexafluoride WF6
Formaldehyde CH2O Vinyl Acetate C4H6O2
Germane GeH4 Vinyl Chloride C2H3CL
Hydrazine N2H4
DM-500IS
DM-500IS Instruction Manual Rev 0.1 Page 6 of 30
DM-500IS
DM-500IS-C3H3N
DM-500IS-NH3(-
20°C)
DM-501IS-NH3(-
40°C)
DM-502IS-NH3 (CE)
DM-500IS-AsH3
DM-500IS-Br2
DM-500IS-C4H6
DM-500IS-CS2
DM-500IS-CO
DM-500IS-COS
DM-500IS-CL2
DM-500IS-CLO2 (>10ppm)
DM-501IS-CLO2 (
≤
10ppm)
DM-500IS-B2H6
DM-500IS-C2H6S
DM-500IS-C3H5OCL
DM-500IS-C2H5OH
DM-500IS-C2H5SH
DM-500IS-C2H4
DM-500IS-C2H4O
DM-500IS-F2
DM-500IS-CH2O
DM-500IS-GeH4
DM-500IS-N2H4
200=0.04
n/d
DM-500IS-H2 (ppm
)
n/d
n/d
DM-501IS-H2 (LEL)
100=0
n/d
DM-500IS-HBr
n/d
n/d
DM-500IS-HCL
n/d
n/d
DM-500IS-HCN
n/d
n/d
DM-500IS-H
F
n/d
yes
n/d
DM-500IS-H2S
n/d
n/d
DM-500IS-CH3OH
n/d
n/d
DM-500IS-CH3SH
n/d
n/d
DM-500IS-NO
n/d
n/d
DM-500IS-NO2
n/d
n/d
DM-500IS-O3
n/d
n/d
DM-500IS-COCL2
50=0.5
n/d
DM-500IS-PH3
100=0.01
n/d
DM-500IS-SiH4
100=<1
n/d
DM-500IS-SO2
n/d
n/d
DM-500IS-C4H8S
n/d
n/d
DM-500IS-C4H4S
n/d
n/d
DM-500IS-C6H5CH3
n/d
n/d
DM-500IS-C4H6O2
n/d
n/d
DM-500IS-C2H3CL
n/d
n/d
3.4 Interference Gas Table (page 1 of 5)
NOTE: Reference the listing in Table 1 to match model number with gas name. Reference the listing in section
3.3 to match the interfering gas symbol with the gas name.
Model Number C2H30 C2H2 C3H3N Alcohols Amines NH3 AsF3 AsF5 AsH3 BF3 Br2 C4H6 Buten-1
DM-500IS-C2H3O n/a 40=340 40=75 n/d n/d n/d n/d n/d n/d n/d n/d 40=170 n/d
DM-500IS-C2H2 340=40 n/a 340=75 n/d n/d n/d n/d n/d n/d n/d n/d 340=170 n/d
75=40 75=340 n/d n/d n/d n/d n/d n/d n/d n/d n/d 75=170 n/d
n/d n/d n/d 1000=0 yes n/d n/a n/d n/d 1=0 n/d n/d n/d n/d
n/d n/d n/d n/d yes n/d n/d n/d n/d 1=0 n/d n/d n/d n/d
n/d n/d n/d n/d n/d n/d n/d n/d n/a n/d n/d n/d n/d
n/d n/d n/d n/d n/d 100=0.01 n/d n/a n/d n/d n/d n/d n/d
n/d n/d n/d n/d n/d n/d n/d n/d n/d n/d n/a n/d n/d
170=40 170=340 170=75 n/d n/d n/d n/d n/d n/d n/d n/d n/a n/d
140=40 140=340 140=75 n/d n/d n/d n/d n/d n/d n/d n/d 140=170 n/d
n/d n/d n/d n/d n/d n/d n/d n/d n/d n/d n/d n/d n/d
135=40 135=340 135=75 n/d n/d n/d n/d n/d n/d n/d n/d 135=170 n/d
n/d n/d n/d n/d n/d n/d n/d n/d n/d n/d 1=0.55 n/d n/d
n/d n/d n/d n/d n/d n/d n/d n/d n/d n/d 1=0.18 n/d n/d
n/d n/d n/d n/d n/d n/d n/d n/d n/d n/d n/d n/d n/d
n/d n/d n/d n/d n/d 100=0.013 n/d n/d 0.15=0.2 n/d n/d n/d n/d
150=40 150=340 150=75 n/d n/d n/d n/d n/d n/d n/d n/d 150=170 n/d
50=40 50=340 50=75 n/d n/d n/d n/d n/d n/d n/d n/d 50=170 n/d
180=40 180=340 180=75 n/d n/d n/d n/d n/d n/d n/d n/d 180=170 n/d
n/d n/d n/d n/d n/d n/d n/d n/d n/d n/d n/d n/d n/d
220=40 220=340 220=75 n/d n/d n/d n/d n/d n/d n/d n/d 220=170 n/d
275=40 275=40 275=75 n/d n/d n/d n/d n/d n/d n/d n/d 275=170 n/d
n/d n/d n/d 1000=0 n/d n/d n/d n/d 0.1=0 n/d yes n/d n/d n/d
330=40 330=340 330=75 n/d n/d n/d n/d n/d n/d n/d n/d 330=170 n/d
n/d n/d n/d n/d n/d 100=<1 n/d n/d 0.2=0.14 n/d n/d n/d n/d
n/d n/d n/d 1000=0 n/d
n/d n/d n/d n/d n/d
n/d n/d n/d n/d n/d
n/d n/d n/d 1000=0 No
n/d n/d n/d 1000=0 No
n/d n/d n/d 1000=0 n/d
n/d n/d n/d 1000=0 n/d
n/d n/d n/d n/d n/d
415=40 415=340 415=75 n/d n/d
n/d n/d n/d n/d n/d
n/d n/d n/d n/d n/d
n/d n/d n/d n/d n/d
n/d n/d n/d n/d n/d
n/d n/d n/d 1000=0 n/d
n/d n/d n/d n/d n/d
n/d n/d n/d n/d n/d
n/d n/d n/d n/d n/d
n/d n/d n/d n/d n/d
45=40 45=340 45=75 n/d n/d
55=40 55=340 55=75 n/d n/d
200=40 200=340 200=75 n/d n/d
200=40 200=340 200=75 n/d n/d
n/a = not applicable
n/d = no data
n/d 0.1=0.1 n/d n/d n/d n/d
n/d n/d n/d n/d n/d n/d
n/d n/d n/d n/d n/d n/d
n/d 0.1=0.3 n/d n/d n/d n/d
n/d 0.1=0.3 n/d n/d n/d n/d
n/d 0.1=0 n/d yes n/d n/d n/d
yes n/d 0.1=0 yes n/d n/d n/d n/d
n/d n/d n/d n/d n/d n/d
n/d n/d n/d n/d 415=170 n/d
n/d n/d n/d n/d 275=170 n/d
n/d n/d n/d n/d n/d n/d
n/d n/d n/d n/d n/d n/d
n/d 0.1=0.05 n/d yes n/d n/d n/d
n/d n/d n/d n/d n/d n/d
n/d 1=1 n/d n/d n/d n/d
n/d 0.2=0.14 n/d n/d n/d n/d
n/d n/d n/d n/d n/d n/d
n/d n/d n/d n/d n/d n/d
n/d n/d n/d n/d 45=170 1%=1.8
n/d n/d n/d n/d 55=170 n/d
n/d n/d n/d n/d 200=170 n/d
n/d n/d n/d n/d 200=170 n/d
DM-500IS Instruction Manual Rev 0.1 Page 7 of 30
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