Detcon Model 1000
H2S Process Analyzer - Electrochemical Sensor
PARTNO.
MODELNO.
SERIALNO.
INPUTVOLTAGE
FREQUENCY
CURRENTLOAD
AREACLASSIFICATION
3200A-1Research ForestDr.
TheWoodlands,TX 77381
www.detcon.com
detconinc.
SAMPLE
FLOW
AIR AIR
INLET
AIR
FLOW
SAMPLE
SAMPLE
SAMPLE
INLET
OUTLET
SAMPLEPRESSURE
10PSIG (CONSTANT)
INLET
Operator’s Installation and Instruction Manual
Detcon Model 1000 Series H2S Analyzer consists of two major assemblies:
1. The Model 1000 Series gas sample-conditioning assembly.
2. The Model DM-624 H2S gas sensor (using Alcohol Free - Electrochemical Sensor or
Hi-Range Electrochemical Sensor)
DETCON, Inc.
4055 Technology Forest Blvd.,
The Woodlands, Texas 77381
Ph.281.367.4100 / Fax 281.298.2868
www.detcon.com
June 6, 2012• Document #2945• Revision 2.8
This page left intentionally blank
Model 1000 H2S Echem
Model 1000 H2S Echem Instruction Manual ii
Model 1000 H2S Echem
Table of Contents
1. Introduction........................................................................................................................................1
1.1 DM-624 Sensor ...............................................................................................................................1
1.2 Electrochemical Sensor....................................................................................................................2
1.3 Microprocessor Control Circuit........................................................................................................2
1.4 Base Connector Board.....................................................................................................................3
1.5 Interference Data.............................................................................................................................4
1.6 Explosion Proof Enclosures.............................................................................................................4
2. Specifications ......................................................................................................................................5
3. Installation..........................................................................................................................................6
3.1 Mounting.........................................................................................................................................6
3.2 Gas Connections and Sampling System Notes..................................................................................6
3.3 Electrical Connections.....................................................................................................................9
3.4 Relays and RS-485 Setup...............................................................................................................10
4. Start Up.............................................................................................................................................12
5. Operating Software........................................................................................................................... 13
5.1 Programming Magnet Operating Instructions................................................................................. 13
5.2 Operating Software........................................................................................................................13
5.2.1 Normal Operation..................................................................................................................13
5.2.2 Calibration Mode...................................................................................................................14
5.2.3 Program Mode....................................................................................................................... 14
5.2.4 Software Flow Chart.............................................................................................................. 16
6. Calibration and Maintenance........................................................................................................... 16
6.1.1 Zero Calibration....................................................................................................................17
6.1.2 Span Calibration....................................................................................................................17
7. Programming Alarms....................................................................................................................... 19
7.1 Alarm Reset...................................................................................................................................19
7.2 Other Alarm Functions ..................................................................................................................19
8. Programming Features..................................................................................................................... 19
9. RS-485 Protocol ................................................................................................................................20
10. Display Contrast Adjustment...........................................................................................................22
11. Low Flow Fault Options...................................................................................................................22
12. Sensor Replacement..........................................................................................................................23
13. Troubleshooting................................................................................................................................23
14. Spare Parts........................................................................................................................................24
15. Warranty........................................................................................................................................... 26
16. Flow Diagrams.................................................................................................................................. 27
17. Wiring Diagram................................................................................................................................ 29
Appendix C .................................................................................................................................................30
Revision Log ............................................................................................................................................30
Model 1000 H2S Echem Instruction Manual iii
Model 1000 H2S Echem
Table of Figures
Figure 1 DM-624 Sensor................................................................................................................................ 1
Figure 2 Construction of Electrochemical Sensor............................................................................................ 2
Figure 3 Functional Block Diagram................................................................................................................ 3
Figure 4 DM-624 Control Circuit ................................................................................................................... 3
Figure 5 Connector Board Terminals.............................................................................................................. 3
Figure 6 Explosion proof enclosures............................................................................................................... 4
Figure 7 Unit Dimensions............................................................................................................................... 6
Figure 8 Port Identification............................................................................................................................. 7
Figure 9 Optional Bubbler Bottle.................................................................................................................... 8
Figure 10 Installation Wiring Connections...................................................................................................... 9
Figure 11 Alarm Jumpers ..............................................................................................................................10
Figure 12 RS-485 Dip Switches.....................................................................................................................11
Figure 13 Programming Magnet ....................................................................................................................13
Figure 14 DM-624 Software Flow Chart........................................................................................................16
Figure 15 Analyzer Parts Identification..........................................................................................................24
Figure 16 DM-624 Replacement Parts...........................................................................................................25
Figure 17 Unit Flow Diagram........................................................................................................................27
Figure 18 Pump Box Flow Diagram ..............................................................................................................28
Figure 19 Wiring Diagram.............................................................................................................................29
List of Tables
Table 1 Hexadecimal Conversion ..................................................................................................................11
Table 2 Sample Flow Rate.............................................................................................................................12
Table 3 Sample Flow Rate.............................................................................................................................17
Shipping Address: 4055 Technology Forest Blvd., The Woodlands Texas 77381
Phone: 888.367.4286, 281.367.4100 • Fax: 281.292.2860 • www.detcon.com • sales@detcon.com
Model 1000 H2S Echem Instruction Manual iv
Mailing Address: P.O. Box 8067, The Woodlands Texas 77387-8067
Model 1000 H2S Echem
1. Introduction
The Detcon Model 1000 Series H2S Process Analyzer is a 110/220VAC or 24VDC powered analyzer that
provides a select gas sample mixture to an on-board DM-624 H2S gas sensor assembly. The range of gas
analysis can span from 0-10ppm up to 0-5% (see Table 2 Sample Flow Rate). The range of analysis is
determined at time of order.
The NEMA 7X rating is achieved by housing all electronic components in suitable NEMA 7X enclosures.
When located outdoors, the H2S Process Analyzer package should be appropriately covered from direct
weather exposure. The Model 1000 Series H2S Process Analyzer can optionally be ordered with a full NEMA
4 enclosure.
The “Power Supply” explosion proof enclosure on the upper right side of the unit houses a 24VDC power
supply, a 24V DC-DC Converter, and a terminal PCB labeled for all input and output field wiring. The
“Pump/Flow” explosion proof enclosure located on the upper left houses an air dilution pump, an activated
carbon scrubber, and optional air flow fault and sample flow fault alarm PCB’s.
The analyzer requires a constant, liquid-free, 10±2psig sample pressure, which is provided by the customer or
may be supplied by Detcon as a separate gas sample handling system.
The on-board gas sample conditioning system includes a stainless steel pressure gauge (0-30psig), and a Genie
membrane filter to provide the analyzer with absolute condensate liquid protection. On the bypass port of the
Genie membrane filter, a 15 psig over-pressure relief valve and flow control valve are also provided. The flow
control valve can be used as a continuous sample bypass and liquid exhaust vent. A dedicated air and sample
mixture is maintained via 2 control valves and 2 rotameters. The Sample is then delivered to the Model DM624 H2S gas sensor for analysis. An optional on-board span gas cylinder is provided for span calibration, and
a selectable 3-way valve is provided for manually switching between sample monitoring and span calibrations.
An optional Acetic Acid Bubbler apparatus is available to scrub the gas sample when it contains high
concentrations of VOC’s as found in some injection spray H2S scavenger chemistries. An optional live heat
tracing feature may be used to prevent condensation after the Genie Membrane Filter.
®
1.1 DM-624 Sensor
Figure 1 DM-624 Sensor
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 1 of 30
Model 1000 H2S Echem
NOTE:
This particular sensor cell is unique in that it has no cross
-
sensitivity to alcohol vapors
Detcon MicroSafe™ Model DM-624, toxic sensors are non-intrusive “Smart” sensors designed to detect and
monitor for H2S gas in the ppm range. A primary feature 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 features
field adjustable, fully programmable alarms and provides relays for two alarms plus fault as standard. The
sensor comes with two different outputs: analog 4-20mA, and serial RS-485. These outputs allow for greater
flexibility in system integration and installation. 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 window that allows for the display of sensor readings as well as access to the sensor’s
menu driven features via a hand-held programming magnet.
1.2 Electrochemical Sensor
The sensor is an electrochemical cell. 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 cell is diffusion limited via small capillary barriers resulting in long service life of up to 3 or more years
depending on the application.
and thus is a good choice for measuring H2S in natural gas pipelines.
Figure 2 Construction of Electrochemical Sensor
DM-624 Electrochemical Sensor 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 stainless steel filter and 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
sample gas conditions.
1.3 Microprocessor Control Circuit
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 pre-amplifier, on-board
power supplies, microprocessor, back lit alpha numeric display, alarm status LED indicators, magnetic
programming switches, an RS-485 communication port, and a linear 4-20mA DC output.
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 2 of 30
Figure 3 Functional Block Diagram
Model 1000 H2S Echem
Figure 4 DM-624 Control Circuit
1.4 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, alarm relays, lugless
terminals for all field wiring, and a terminal strip for storing unused programming jumper tabs. The alarm
relays are contact rated 5 amps @ 250VAC, 5 amps @ 30VDC and coil rated at 24VDC. Gold plated program
jumpers are used to select either the normally open or normally closed relay contacts.
Figure 5 Connector Board Terminals
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 3 of 30
Model 1000 H2S Echem
1.5 Interference Data
DM-624 series electrochemical H2S sensors are subject to interference from other gases. This interaction is
shown in the following table as the relation between the amount of the interfering gas applied to the sensor,
and the corresponding reading that will occur (in ppm).
Gas Interference
Carbon monoxide 300ppm 1.5ppm
Chlorine 1ppm = -0.2ppm
Ethyl mercaptan 3ppm = 1ppm
Ethylene 100ppm = 0
Hydrogen 1% = < 5ppm
Hydrogen chloride 5ppm = 0
Hydrogen cyanide 10ppm = 0
Nitric oxide 35ppm < 2ppm
Nitrogen dioxide 5ppm = -0.5ppm
Sulfur dioxide 5ppm < 1ppm
Methyl mercaptan 2ppm = 1ppm
1.6 Explosion Proof Enclosures
The sensor is 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 faceplate are
activated through the lens window via a hand-held magnetic programming tool allowing non-intrusive
operator interface with the sensor. All calibration and alarm level adjustments can be accomplished without
removing the cover or declassifying the area. Electrical classification is Class I; Div. 1; Groups C, D.
Flow Fault (optional)
Pump/Scrubber
Left
Power Supply/
Terminal PCB
+ +
24VDC
18-36
OUT
VDC
2.1A
IN
Right
Sensor (side view)
Sensor
Figure 6 Explosion proof enclosures
A 24VDC power supply and termination PCB for the power, relay contacts, 4-20mA output, and/or RS485
signal are located in the upper right explosion proof enclosure. The pump and optional low flow fault
assemblies are located in the upper left explosion proof enclosure. Declassify the work area before removing
covers.
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 4 of 30
Model 1000 H2S Echem
2. Specifications
Sensor Type
Electrochemical cell
Measurement Range
0-10ppm H2S, up to 0-5 % H2S
Accuracy/Repeatability
±10% of reading or ±0.5ppm, whichever is greater
Response/Clearing Time
T80 < 1 minute
Operating Temperature
-40°F to +122°F: -40°C to +50°C
Outputs
Linear 4-20mA DC; RS-485 Modbus™; 3 relays (alarm 1, alarm 2, and fault), Contacts rated 5 amps
Input Voltage
110~220VAC; 18~36VDC
Power Consumption
700mA (16.8 watts)
Electrical Classification
Explosion Proof; Class I, Division 1, Groups C, D
Sensor Life/Warranty
Sensor: 6 month conditional warranty; Transmitter: 2 year warranty
Analyzer Weight
70 lbs.
Dimensions
29” X 29” X 8”
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 5 of 30
Model 1000 H2S Echem
3. Installation
3.1 Mounting
Securely mount the Model 1000 analyzer panel or NEMA 4 enclosure (optional) in accordance with Figure 7.
Figure 7 Unit Dimensions
3.2 Gas Connections and Sampling System Notes
1. Install a length of tubing from the desired sample point to the sample input port (as shown in Figure 8).
Sample draw tubing should be 316 stainless steel of ¼" O.D.
NOTE: A constant pressure of 10±2psig should be provided to the analyzer for proper operation. In
applications where line pressure varies significantly, two-stage pressure regulation is recommended to
hold the constant pressure. Ideally, the pressure drop from the source to 10psig for analyzer should be
taken as close to the pipeline as possible. This speeds up response time to actual gas concentration
changes. An insertion probe membrane device is advisable to use for pipeline sources with high levels of
condensates, mist, and contamination.
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 6 of 30
AIR AIR
INLET
MODELNO.
SERIALNO.
INPUTVOLTAGE
FREQUENCY
CURRENTLOAD
AREACLASSIFICATION
Model 1000 H2S Echem
PARTNO.
3200A-1ResearchForest Dr.
TheWoodlands,TX77381
www.detcon.com
detconinc.
AIR
FLOW
Calibrate
Cal Gas
H2S Vent
Pressure Gauge
Sample Inlet Port
These may be
combined into a
single vent
NOTE:
SAMPLE
FLOW
SAMPLEPRESSURE
10PSIG(CONSTANT)
SAMPLE
INLET
Sample
Sample Bypass and Liquid
Rejection Exhaust Vent.
Figure 8 Port Identification
2. Whenever possible, the Sample Bypass flow control valve of the Genie membrane filter should be used to
minimize the sample lag time between the sample tap and the analyzer location. It can also be used as a
means to exhaust condensed liquids in the sample line away from the Genie filter and prevent a “loss of
flow” condition. Set a flow of 100-200cc/min. and vent to a safe area using ¼” O.D. tubing.
3. Connect to the Over-pressure Relief valve and vent to a safe area. The pressure relief valve is set at
Detcon to open at 15-20psig. For convenience sake, the sample bypass and over-pressure relief can be
vented together.
4. Install a length of ¼" OD stainless steel tubing from the vent port to an area deemed safe for venting as
shown below. Venting pressure should be in the range of 0±1psig and ambient pressure is highly
preferred.
5. When the optional Acetic Acid Bubbler apparatus is used, prior to applying power and applying gas flow
the bubbler should be filled to the maximum fill level with a 5% acetic acid solution. (Standard white
vinegar is also acceptable).
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 7 of 30
Air Inlet Port
Model 1000 H2S Echem
Pressure Guage
Sample Inlet Port
NOTE:
These can be
combined into a
single Vent.
SAMPLE
FLOW
Sample Calibrate
Sample Bypass and Liquid
Rejection Exhaust Vent.
Over Pressure Relief Vent
Figure 9 Optional Bubbler Bottle
AIR
FLOW
Optional
Acetic
Acid
Bubbler
Bottle
H2S Vent
Port
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 8 of 30
3.3 Electrical Connections
Customer Connections
+ +
+ +
24VDC
24VDC
18-36
18-36
OUT
OUT
VDC
VDC
2.1A
2.1A
IN
IN
Model 1000 H2S Echem
INPUT
+24VDC
+
-24VDC
-
(Ground)
+ +
24VDC
18-36
OUT
VDC
2.1A
IN
AIR
SAMPLE
FLOW
FLOW
117VAC / 24VDC In
4-20mA, RS485,
Alarm/Fault Sensor Relays
Low Flow Air/ Sample Relays
(Optional)
Figure 10 Installation Wiring Connections
1. For AC powered unit connect 117/220VAC to the terminal connector labeled “VAC IN” ( JP8A) inside
the explosion-proof enclosure on the upper right. If applicable, connect 24VDC to the Terminal
Connector Board labeled “VDC IN” (JP7A) (See Figure 10.)
2. The 4-20mA and/or RS-485 signal outputs should be wired from the terminal PCB and then out the right
side of the “Power Supply” explosion-proof enclosure (Figure 10).
3. Discrete alarm relay contacts are provided for three alarms: Fault, Low and High. The contacts consist of
common and choice of normally open or normally closed. Contact output selections are jumper
programmable on the sensor connector board. See DM-624 wiring diagram for details. These connections
also should be wired out of the right side of the “Power Supply” explosion-proof enclosure. (Figure 10).
4. Optional Low Flow Fault alarms for Sample gas and Air are available. They provide a form “C” relay
contact (common, normally open and normally closed) rated 1 amp at 30VDC/0.24 amp at 125VAC.
Relay contacts are pre-wired to the I/O connector PCB located in the “Power Supply” explosion-proof
enclosure and are labeled “FLO FLT1” and “FLO FLT2” respectively (Figure 10).
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 9 of 30
Model 1000 H2S Echem
3.4 Relays and RS-485 Setup
Program the alarms via the gold plated jumper tab positions located on the CPU board (Figure 11). Alarm 1
and Alarm 2 have three jumper programmable functions: latching/non-latching relays, normally
energized/normally de-energized relays, and ascending/descending alarm set points. The fault alarm has two
jumper programmable functions: latching/non-latching relay, and normally energized/normally de-energized
relay. The default settings of the alarms (jumpers removed) are normally de-energized relays, non-latching
relays, and alarm points that activate during descending gas conditions.
Figure 11 Alarm Jumpers
If a jumper tab is installed in the latch position that alarm relay will be in the latching mode. The latching
mode will latch the alarm after alarm conditions have cleared until the alarm reset function is activated. The
non-latching mode (jumper removed) will allow alarms to de-activate automatically once alarm conditions
have cleared.
If a jumper tab is installed in the energize position, that alarm relay will be in the energized mode. The
energized mode will energize or activate the alarm relay when there is no alarm condition and de-energize or
de-activate the alarm relay when there is an alarm condition. The de-energized mode (jumper removed) will
energize or activate the alarm relay during an alarm condition and de-energize or de-activate the alarm relay
when there is no alarm condition.
If a jumper tab is installed in the ascending position that alarm relay will be in the ascending mode. The
ascending mode will cause an alarm to fire when the gas concentration detected is greater than or equal to the
alarm set point. The descending mode (jumper removed) will cause an alarm to fire when the gas
concentration detected is lesser than or equal to the alarm set point. Except in special applications, H2S
monitoring will require alarms to fire in “ASCENDING” gas conditions.
Any unused jumper tabs should be stored on the connector board on the terminal strip labeled “Unused
Jumpers”.
If applicable, set the RS-485 ID number via the two rotary dip switches located on the preamp board (see
Figure 12). There are 256 different ID numbers available, which are based on the hexadecimal numbering
system. If RS-485 communications are used, each sensor must have its own unique ID number. Use a
jeweler’s screwdriver to set the rotary dipswitches according to Table 1 Hexadecimal Conversion. If RS-485
communications are not used, leave the dipswitches in the default position, which is zero/zero (0)-(0).
Replace the plug-in control circuit and replace the junction box cover.
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 10 of 30
Model 1000 H2S Echem
ID#
SW1
SW2
ID#
SW1
SW2
ID#
SW1
SW2
ID#
SW1
SW2
ID#
SW1
SW2
ID#
SW1
SW2
00432B865612981
172AC
215D7
5054830915B
13486
177B1
220DC6064931925C13587
178B2
221DD
110B54369761
1408C
183B7
226E2120C553798621418D
184B8
227E3
1812613D10468
14793
190BE
233E9
Table 1 Hexadecimal Conversion
none
1 0 1 44 2 C 87 5 7 130 8 2 173 A D 216 D 8
2 0 2 45 2 D 88 5 8 131 8 3 174 A E 217 D 9
3 0 3 46 2 E 89 5 9 132 8 4 175 A F 218 D A
4 0 4 47 2 F 90 5 A 133 8 5 176 B 0 219 D B
7 0 7 50 3 2 93 5 D 136 8 8 179 B 3 222 D E
8 0 8 51 3 3 94 5 E 137 8 9 180 B 4 223 E F
9 0 9 52 3 4 95 5 F 138 8 A 181 B 5 224 E 0
10 0 A 53 3 5 96 6 0 139 8 B 182 B 6 225 E 1
13 0 D 56 3 8 99 6 3 142 8 E 185 B 9 228 E 4
14 0 E 57 3 9 100 6 4 143 8 F 186 B A 229 E 5
15 0 F 58 3 A 101 6 5 144 9 0 187 B B 230 E 6
16 1 0 59 3 B 102 6 6 145 9 1 188 B C 231 E 7
17 1 1 60 3 C 103 6 7 146 9 2 189 B D 232 E 8
19 1 3 62 3 E 105 6 9 148 9 4 191 B F 234 E A
20 1 4 63 3 F 106 6 A 149 9 5 192 C 0 235 E B
21 1 5 64 4 0 107 6 B 150 9 6 193 C 1 236 E C
22 1 6 65 4 1 108 6 C 151 9 7 194 C 2 237 E D
23 1 7 66 4 2 109 6 D 152 9 8 195 C 3 238 E E
24 1 8 67 4 3 110 6 E 153 9 9 196 C 4 239 F F
25 1 9 68 4 4 111 6 F 154 9 A 197 C 5 240 F 0
26 1 A 69 4 5 112 7 0 155 9 B 198 C 6 241 F 1
27 1 B 70 4 6 113 7 1 156 9 C 199 C 7 242 F 2
28 1 C 71 4 7 114 7 2 157 9 D 200 C 8 243 F 3
29 1 D 72 4 8 115 7 3 158 9 E 201 C 9 244 F 4
30 1 E 73 4 9 116 7 4 159 9 F 202 C A 245 F 5
31 1 F 74 4 A 117 7 5 160 A 0 203 C B 246 F 6
32 2 0 75 4 B 118 7 6 161 A 1 204 C C 247 F 7
33 2 1 76 4 C 119 7 7 162 A 2 205 C D 248 F 8
34 2 2 77 4 D 120 7 8 163 A 3 206 C E 249 F 9
35 2 3 78 4 E 121 7 9 164 A 4 207 C F 250 F A
36 2 4 79 4 F 122 7 A 165 A 5 208 D 0 251 F B
37 2 5 80 5 0 123 7 B 166 A 6 209 D 1 252 F C
38 2 6 81 5 1 124 7 C 167 A 7 210 D 2 253 F D
39 2 7 82 5 2 125 7 D 168 A 8 211 D 3 254 F E
40 2 8 83 5 3 126 7 E 169 A 9 212 D 4 255 F F
41 2 9 84 5 4 127 7 F 170 A A 213 D 5
42 2 A 85 5 5 128 8 0 171 A B 214 D 6
Figure 12 RS-485 Dip Switches
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 11 of 30
Model 1000 H2S Echem
NOTE
: All alarms will be disabled for 1 minute after power up. In the event of power failure,
NOTE:
Sample flow rates must be actual rotameter set
-
point flow rates, after properly
DM-624 Range
Sample Flow
Air Flow
Span Gas Flow
H2S Cal Gas
0-10
500
100-
20
500
100-
25
500
100-
50
500
10 or 25
0-100
500
25 or 50
0-150
500
25 or 50
0-500
1000
1000-1000
500
100 or 250
0-5000
800
1,000 or 2,500
0-10,000
800
2,500 or 5,000
0-5%
1000
1% or 2.5%
NOTE:
A displayed methane (typical natural gas) sample flow of 200cc/min. is actually equal
4. Start Up
Upon completion of all tubing connections and field wiring the Model 1000 Series Process Analyzer is ready
for startup. Note that after power is applied, varying readings may occur during sensor warm-up. Allow at
least 1 hour for stabilization (24 hours is best). With sample gas and air flowing, apply system power and
observe the following normal conditions:
a) DM-624 “Fault” LED’s are off.
b) A reading close to the anticipated H2S level should be indicated upon conclusion of a 1-minute “warming
up” cycle.
the alarm disable period will begin again once power has been restored.
1. If applicable make sure the optional Acetic Acid Bubbler is filled with the proper solution. (5% acetic
acid solution or standard white vinegar.)
2. Set the sample pressure to 10psig and verify the proper set point at the pressure gauge
3. Set the airflow through the Air sample rotameter. Adjust the rotameter flow valve to 250cc/min and in
alignment with the “” mark on the rotameter.
accounting for rotameter gas density effects, see Table 2.
Table 2 Sample Flow Rate
(ppm)
4. Adjust the sample mass flow controller valve per table above to meet the designated sample flow target
mark labeled as “S”. The “C” indicator on the rotameter shows what Flow rate to calibrate at if the
cal gas is N2. If the cal gas is in methane, then span gas flow should be set to “S”.
(cc/min)
200 Labeled “S”
200 Labeled “S”
200 Labeled “S”
200 Labeled “S”
200 Labeled “S”
200 Labeled “S”
80 Labeled “S”
200 Labeled “S”
200 Labeled “S”
80 Labeled “S”
200 Labeled “S”
(cc/min)
(cc/min)
250 Labeled “C”
250 Labeled “C”
250 Labeled “C”
250 Labeled “C”
250 Labeled “C”
250 Labeled “C”
100 Labeled “C”
250 Labeled “C”
250 Labeled “C”
100 Labeled “C”
250 Labeled “C”
(ppm)
to 250cc/min. of nitrogen when accounting for the 20% gas density affect on the rotameter. A
displayed methane flow of 80cc/min. is actually 100cc/min. when accounting for the density
effect.
5. Set the airflow rotameter per the Air Flow value in Table 2 that corresponds to the DM-624 Sensor Range.
6. Proceed with calibration per Section 6 Calibration and Maintenance.
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 12 of 30
Model 1000 H2S Echem
NOTE:
If, after entering the calibration or program menus, there is no interaction with the
5. Operating Software
5.1 Programming Magnet Operating Instructions
Operator interface to MicroSafe™ gas detection products is via magnetic switches located behind the
transmitter faceplate. DO NOT remove the glass lens cover to calibrate or change programming parameters.
Two switches labeled “PGM 1” and “PGM 2” allow for complete calibration and alarm level programming
without removing the enclosure cover, thereby eliminating the need for area de-classification or the use of hot
permits.
Figure 13 Programming Magnet
A magnetic programming tool (Figure 13) is used to operate the switches. Switch action is defined as
momentary contact, 3-second hold, and 30-second hold. In momentary contact use, the programming magnet
is waved over a switch location. In 3-second hold, the programming magnet is held in place over a switch
location for 3 or more seconds. In 30-second hold, the programming magnet is held in place over a switch
location for 30 or more seconds. Three and 30-second hold is used to enter or exit calibration and program
menus while momentary contact is used to make adjustments. The location of “PGM 1” and “PGM 2” are
shown in section 1.3.
menu items for more than 30 seconds, the sensor will return to its normal operating condition.
5.2 Operating Software
Operating software is menu listed with operator interface via the two magnetic program switches located under
the faceplate. The two switches are referred to as “PGM 1” and “PGM 2”. The menu list consists of 3 items
which include submenus as indicated below.
01. Normal Operation
a) Current Status
02. Calibration Mode
a) Zero
b) Span
03. Program Menu
a) Program Status
b) Alarm 1 Level
c) Alarm 2 Level
d) Calibration Level
5.2.1 Normal Operation
In normal operation, the display tracks the status of the sensor and gas concentration and appears as: “##.##
PPM H2S”. The milliamp current output corresponds to the monitoring level and range of the sensor, where
Full Scale is 20mA.
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 13 of 30
Model 1000 H2S Echem
5.2.2 Calibration Mode
Calibration mode allows for sensor zero and span adjustments. It uses an “AUTO SPAN” sequence with built
in diagnostics to ensure adequate sensor response and signal stability “1-ZERO 2-SPAN”.
Zero Adjustment
Zero is set with no H2S target gases present. “AUTO ZERO”
Span Adjustment
Span adjustment is performed with a target gas concentration of 10 ppm H2S in nitrogen. Span gas
concentrations other than 10 ppm may be used “AUTO SPAN”. See Table 3 Sample Flow Rate.
5.2.3 Program Mode
Program Mode provides a program status menu (View Program Status) to check operational parameters.
Program Mode also allows for the adjustment of alarm set point levels, the calibration gas level setting,
View Program Status
View Program Status is a listing that allows the operator to view the gas, range, and software version number
of the program, as well as the current alarm settings, calibration gas level setting, offset value, RS-485 ID
number, heater voltage, and estimated remaining sensor life.
The following procedure is used to view the programming status of the sensor:
a) Enter the programming menu by holding the programming magnet stationary over “PGM 2” for 15
seconds. When the display changes to “VIEW PROG STATUS”, withdraw the magnet. Scroll through
the programming menu by momentarily waving the programming magnet over either “PGM 1” or “PGM
2”. The menu options are: View Program Status, Set Alarm 1 Level, Set Alarm 2 Level, and Set Cal
Level.
b) Scroll to the “VIEW PROG STATUS” listing and hold the programming magnet over “PGM 1” for 3
seconds. The display will automatically scroll, at five second intervals, through the following information
before returning back to the “VIEW PROG STATUS” listing.
Gas type and software version number.
Alarm set point level of alarm 1. The menu item appears as: “ALM1 SET @ ##PPM”
Alarm firing direction of alarm 1. The menu item appears as: “ALM1 ASCENDING” or descending.
Alarm relay latch mode of alarm 1. The menu item appears as: “ALM1 NONLATCHING” or latching.
Alarm relay energize state of alarm 1. The menu item appears as: “ALM1 DE-ENERGIZED” or
energized.
Alarm set point level of alarm 2. The menu item appears as: “ALM2 SET @ ##PPM”
Alarm firing direction of alarm 2. The menu item appears as: “ALM2 ASCENDING” or descending.
Alarm relay latch mode of alarm 2. The menu item appears as: “ALM2 LATCHING” or non-latching.
Alarm relay energize state of alarm 2. The menu item appears as: “ALM2 DE-ENERGIZED” or
energized.
Alarm relay latch mode of the fault alarm. The menu item appears as: “FLT NONLATCHING” or
latching.
Alarm relay energize state of the fault alarm. The menu item appears as: “FLT ENERGIZED” or de-
energized.
Calibration gas level setting. The menu item appears as: “CalLevel @ ##PPM”
Identification of the RS-485 ID number setting. The menu item appears as: “485 ID SET @ ##”
Estimated remaining sensor life. The menu item appears as: “SENSOR LIFE 100%”
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 14 of 30
Model 1000 H2S Echem
c) Exit back to normal operations by holding the programming magnet over “PGM 2” for 3 seconds, or, the
sensor will automatically return to normal operation in 30 seconds.
Alarm 1 Level Adjustment
The alarm 1 level is adjustable over the range 10% to 90% of range. For hydrogen sulfide gas sensors, the
level is factory set at 20% F.S. The menu item appears as: “SET ALM1 @ ### PPM”.
Alarm 2 Level Adjustment
The alarm 2 level is also adjustable over the range 10% to 90% of range. For hydrogen sulfide gas sensors, the
level is factory set at 60 % Full Scale. The menu item appears as: “SET ALM2 @ ### PPM”
Calibration Level Adjustment
The Calibration level is adjustable from 10% to 90% of range. The menu item appears as: “CAL LEVEL @
## PPM”
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 15 of 30
5.2.4 Software Flow Chart
Model 1000 H2S Echem
Figure 14 DM-624 Software Flow Chart
6. Calibration and Maintenance
The Model 1000 Series H2S Process Analyzer is calibrated prior to shipment. Only minimal adjustment
should be required at time of commissioning. However, it is highly recommended that a zero and span
calibration be performed twice in the first week of operation to assure optimum system performance. After
that, a recalibration interval of every month is recommended.
Maintenance
When the Acetic Acid Bubbler option is used, the 5% acetic acid solution (or white vinegar) should be kept
near the Max fill mark on the bottle. The level should be checked monthly and the entire solution contents
should be changed every 6 months.
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 16 of 30
Model 1000 H2S Echem
0-10
500
100-
20
500
100-
25
500
100-
50
500
10 or 25
0-100
500
25 or 50
0-150
500
25 or 50
0-500
1000
1000-
1000
500
100 or 250
0-5000
800
1000 or 2500
0-10,000
800
2,500 or 5,000
0-5%
1000
1% or 2.5%
Material Requirements
Detcon Part Number 327-000000-000 MicroSafe™ Programming Magnet.
Detcon Part Number 942-001123-000 Zero Air cal gas. (Ambient air can be used, if it can be verified that
no target gas is present).
Span gas cylinder containing H2S gas in background N2 (nitrogen) as per the following range table. If
available, span gas cylinders in background Methane (natural gas) or air can also be used.
6.1.1 Zero Calibration
Zero Calibration should be performed quarterly in the field. The AutoZero function is used to zero the sensor.
The dilution airflow (with sample turned off) can be used to zero calibrate the sensor. Alternately, a zero air or
N2cylinder connected to the calibration port can be used.
1) Turn the sample flow mass control off, leaving only the airflow to provide the zero gas. Allow the unit 5
minutes to stabilize.
2) Enter the calibration menu by holding the programming magnet stationary over “PGM 1” (see above) for 3
seconds until the display reads “1-ZERO 2-SPAN”, and remove the magnet. Note that the “CAL” LED
comes on.
3) Enter the zero menu by holding the magnet stationary over “PGM 1” for 3 seconds until the display reads:
“AUTOZERO”, and remove the magnet. The sensor will enter the auto zero mode. When complete the
sensor will display “ZERO COMPLETE” for 5 seconds and then return to the normal operation menu,
“0.00PPM H2S”.
4) Re-open the sample flow mass control and re-establish the target sample flow rate per the arrow indicator
on the H2S sample rotameter.
6.1.2 Span Calibration
Table 3 Sample Flow Rate
DM-624 Range
(ppm)
CAUTION: Verification of the correct calibration gas level setting and calibration span gas
concentration is required before “span” calibration. These two numbers must be equal.
Span Calibration consists of entering the calibration function and following the menu-displayed instructions.
The display will ask for the application of span gas in a specific concentration. The concentration must be
equal to the calibration gas level setting. See Table 3 Sample Flow Rate above for recommended cal gas
concentrations. Other concentrations may be used as long as they fall between 10% and 90% of range.
However, any alternate span gas concentration value must be programmed via the calibration gas level menu
before proceeding with span calibration. Follow the instructions below for span calibration.
Sample Flow
(cc/min)
200 Labeled “S”
200 Labeled “S”
200 Labeled “S”
200 Labeled “S”
200 Labeled “S”
200 Labeled “S”
80 Labeled “S”
200 Labeled “S”
200 Labeled “S”
80 Labeled “S”
200 Labeled “S”
Air Flow
(cc/min)
Span Gas Flow
(cc/min)
250 Labeled “C”
250 Labeled “C”
250 Labeled “C”
250 Labeled “C”
250 Labeled “C”
250 Labeled “C”
100 Labeled “C”
250 Labeled “C”
250 Labeled “C”
100 Labeled “C”
250 Labeled “C”
H2S Cal Gas
(ppm)
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 17 of 30
Model 1000 H2S Echem
NOTE
: If the circuitry is unable to adjust the span to the proper setting the sensor will enter
1) Verify that the current calibration gas level is equal to the calibration span gas concentration. (Refer to
Section 5.2.3 Program Mode, “View Sensor Status”. The item appears as “CAL LEVEL @ ### PPM”.)
2) If the calibration gas level setting is equal to the calibration span gas concentration, proceed to item “3)”.
If the calibration gas level setting is not equal to the calibration span gas concentration, adjust the
calibration gas level setting so that it is equal to the calibration span gas concentration.
a) Enter the programming menu by holding the programming magnet stationary over “PGM 2” for 30
seconds. When the display reads “VIEW PROG STATUS”, withdraw the magnet. Scroll through
the programming menu by momentarily waving the programming magnet over “PGM 1” or “PGM 2”.
The menu options are: View Program Status, Set Alarm 1 Level, Set Alarm 2 Level, Set Heater Level,
and Linearize Sensor.
b) From the programming menu scroll to the calibration level listing. The menu item appears as: “SET
CAL LEVEL”. Enter the menu by holding the programming magnet stationary over “PGM 1” for 3
seconds until the display reads “CAL LEVEL @ ### PPM”, and withdraw the magnet. Use the
programming magnet to increase (PGM 1) or decrease (PGM 2) the display reading until the reading is
equal to the desired calibration span gas concentration.
c) Exit to the programming menu by holding the programming magnet over “PGM1” for 3 seconds.
d) Exit back to normal operation by holding the programming magnet over “PGM 2” for 3 seconds, or,
the sensor will automatically return to normal operation in 30 seconds.
3) Enter the calibration span menu by holding the programming magnet stationary over “PGM 1” for 3
seconds. The display will read “1-SPAN 2-EXIT”. Hold programming magnet stationary over “PGM 1”
for 3 seconds to proceed with span. “APPLY ## PPM” will appear in the display for 10 seconds.
4) Turn the H2S 3-way valve so that the arrow is pointing toward the cal gas source. The sample is now
being drawn from the H2S Calibration Port.
5) Turn the fixed flow regulator on the Cal Gas Bottle to the “ON” position, and set the sample rotameter
mass flow valve so the flow is set to “C” on the rotameter. The airflow should be set per the Air Flow
table. (See Table 3 for these values).
6) As the sensor signal changes, the display will change to “AUTOSPAN ###”. Where “###” indicates the
actual gas reading. The reading will increase/decrease until the sensor stabilizes. When the sensor signal
is stable, the sensor will auto span to the requested concentration and the display will change to “SPAN
COMPLETE” for two seconds and then “REMOVE GAS” for 3 seconds. The analyzer will then return
to normal operation. The Auto Span sequence takes approximately 5 minutes.
7) Turn the fixed flow regulator on the Cal Gas Bottle to the “OFF” position and remove the gas.
into the calibration fault mode which will cause the display to alternate between the sensor’s
current status reading and the calibration fault display: “CAL FAULT”.
8) Turn the 3-way valve so that the arrow is pointing toward the sample source. Establish the target sample
gas flow through the sample rotameter adjusting the flow rate to the “S” reading. Set the air rotameter per
Table 3 (Air Flow column) and the appropriate H2S gas range for the analyzer.
Span calibration is complete. The total time for span calibration is approximately 10 minutes.
Additional Notes
a) Upon entering the calibration menu, the 4-20mA signal drops to 2mA and is held at this level until the
sensor returns to normal operation.
b) If during calibration the sensor circuitry is unable to attain the proper adjustment for span, the sensor will
enter into the calibration fault mode which will activate fault alarm functions and cause the display to
alternate between the sensor’s current status reading and the calibration fault screen which appears as:
“CAL FAULT”. If this occurs, attempt to recalibrate by re-entering the calibration menu. If the sensor
fails again, refer to Section 13, Troubleshooting.
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 18 of 30
Model 1000 H2S Echem
c) After span calibration, the alarm relays remain inactive until the sample gas concentration falls below both
set alarm levels. The alarms will then become active again.
7. Programming Alarms
Both alarm 1 and alarm 2 levels are factory set prior to shipment. Alarm 1 is set at 20% of full-scale range;
alarm 2 at 40% of full-scale range. Both alarms can be set from 10 to 90% of full-scale range. The following
procedure is used to change alarm set points:
a) Enter the programming menu by holding the programming magnet stationary over “PGM 2” for 30
seconds until the display reads “VIEW PROG STATUS”, and withdraw the magnet. Scroll through the
programming menu by momentarily waving the programming magnet over “PGM 1” or “PGM 2”. The
menu options are: View Program Status, Set Alarm 1 Level, Set Alarm 2 Level, and Set Cal Level.
b) ALARM 1 LEVEL: From the programming menu scroll to the alarm 1 level listing. The menu item
appears as: “SET ALARM 1 LEVEL”. Enter the menu by holding the programming magnet stationary
over “PGM 1” for 3 seconds until the display reads “SET ALM1 @ ###PPM”, and withdraw the magnet.
Use the programming magnet to adjust the display reading using “PGM 1” to increase or “PGM 2” to
decrease the reading until the desired alarm set point is reached. Exit to the programming menu by
holding the programming magnet over “PGM1” for 3 seconds.
c) ALARM 2 LEVEL: From the programming menu scroll to the alarm 2 level listing. The menu item
appears as: “SET ALARM 2 LEVEL”. Enter the menu by holding the programming magnet stationary
over “PGM 1” for 3 seconds until the display reads “SET ALM2 @ ###PPM”, and withdraw the magnet.
Use the programming magnet to adjust the display reading using “PGM 1” to increase or “PGM 2” to
decrease the reading until the desired alarm set point is reached. Exit to the programming menu by
holding the programming magnet over “PGM1” for 3 seconds.
d) Exit back to normal operations by holding the programming magnet over “PGM 2” for 3 seconds, or, the
sensor will automatically return to normal operation in 30 seconds.
7.1 Alarm Reset
An alarm condition will cause the applicable alarm to activate its corresponding relay and LED. If alarm 1,
alarm 2, or fault alarms have been programmed for latching relays, an alarm-reset function must be activated
to reset the alarms after an alarm condition has cleared. To reset the alarms, simply wave the programming
magnet over either “PGM 1” or “PGM 2”, momentarily, while in normal operations mode and note that the
corresponding alarm LED(s) turn off.
7.2 Other Alarm Functions
Alarms are factory programmed to be non-latching, de-energized; and to fire under ascending gas conditions.
The fault alarm relay is programmed as normally energized which is useful for detecting a 24VDC power
source failure. All alarm functions are programmable via jumper tabs. Changing alarm functions requires the
sensor housing to be opened, thus declassification of the area is required.
8. Programming Features
Detcon MicroSafe™ H2S gas sensors incorporate a comprehensive program to accommodate easy operator
interface and fail-safe operation. Program features are detailed in this section. Each sensor is factory tested,
programmed, and calibrated prior to shipment.
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 19 of 30
Model 1000 H2S Echem
Over Range
When the sensor detects gas greater than 100% of its range, it will cause the display to flash the highest
reading of its range on and off.
Under Range Faults
If the sensor should drift below the zero baseline by approximately 10% of range, the display will indicate a
fault: “ZERO FAULT”. If the sensor drifts below the normal zero baseline by approximately -30% of range,
the display will indicate a “SIGNAL FAULT”.
Calibration Fault
If during calibration the sensor circuitry is unable to attain the proper adjustment for zero or span, the sensor
will enter into the calibration fault mode and cause the display to alternate between the sensor’s current status
reading and the calibration fault screen which appears as: “CAL FAULT”.
Fail-Safe/Fault Supervision
Detcon MicroSafe™ sensors are programmed for fail-safe operation. Either fault condition will activate the
fault relay, illuminate the fault LED, and cause the display to read its corresponding fault condition: “SIGNAL
FAULT”, or “CAL FAULT”. A “SIGNAL FAULT” will also cause the mA output to drop to zero (0) mA.
Sensor Life
The sensor life feature is a reference based on signal output from the sensor cell. When a sensor life of 25% or
less remains the sensor cell should be replaced within a reasonable maintenance schedule.
9. RS-485 Protocol
Detcon MicroSafe™ sensors feature Modbus™ compatible communications protocol and are addressable via
rotary dip switches for multi-point communications. Other protocols are available. Contact the Detcon factory
for specific protocol requirements. Communication is two wire, half duplex 485, 9600 baud, 8 data bits, 1 stop
bit, no parity, with the sensor set up as a slave device. A master controller up to 4000 feet away can
theoretically poll up to 256 different sensors. This number may not be realistic in harsh environments where
noise and/or wiring conditions would make it impractical to place so many devices on the same pair of wires.
If a multi-point system is being utilized, each sensor should be set for a different address. Typical address
settings are: 01, 02, 03, 04, 05, 06, 07, 08, 09, 0A, 0B, 0C, 0D, 0E, 0F, 10, 11, etc.
In most instances, RS-485 ID numbers are factory set or set during installation before commissioning. If
required, the RS-485 ID number can be set via rotary dip switches located on the preamp circuit board.
However, any change to the RS-485 ID number would require the sensor housing to be opened, thus
declassification of the area would be required. See section 3.5.4-f for details on changing the RS-485 ID
number.
The following section explains the details of the Modbus™ protocol that the Detcon MicroSafe™ sensor
supports.
Code 03 - Read Holding Registers is the only code supported by the transmitter. Each transmitter contains 6
holding registers which reflect its current status.
Register # High Byte Low Byte
40000 Gas type Sensor Life
Gas type is one of the following:
01=CO, 02= H2S, 03=SO2, 04=H2, 05=HCN, 06=CL2, 07=NO2, 08=NO, 09=HCL, 10=NH3, 11=LEL, 12=O
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 20 of 30
2
Model 1000 H2S Echem
Sensor life is an estimated remaining use of the sensor head, between 0% and 100%
Example: 85=85% sensor life
Register # High Byte Low Byte
40001 Detectable Range
i.e. 100 for 0-100 ppm, 50 for 0-50% LEL, etc
Register # High Byte Low Byte
40002 Current Gas Reading
The current gas reading as a whole number: If the reading is displayed as 23.5 on the display, this register
would contain the number 235.
Register # High Byte Low Byte
40003 Alarm 1 Set point
This is the trip point for the first alarm.
Register # High Byte Low Byte
40004 Alarm 2 Set point
This is the trip point for the second alarm.
Register # High Byte Low Byte
40005 Status Bits Status Bits
High Byte
Bit 7 Not used, always 0
Bit 6 Not used, always 0
Bit 5 Not used, always 0
Bit 4 Not used, always 0
Bit 3 1-Unit is in calibration 0-Normal operation
Bit 2 1-Alarm 2 is ascending 0-Alarm 2 is descending
Bit 1 1-Alarm 2 is normally energized 0-Alarm 2 is normally de-energized
Bit 0 1-Alarm 2 is latching 0-Alarm 2 is non-latching
Low Byte
Bit 7 1-Alarm 2 Relay is energized 0-Alarm 2 Relay is not energized
Bit 6 1-Alarm 1 is ascending 0-Alarm 1 is descending
Bit 5 1-Alarm 1 is normally energized 0-Alarm 1 is normally de-energized
Bit 4 1-Alarm 1 is latching 0-Alarm 1 is non-latching
Bit 3 1-Alarm 1 Relay is energized 0-Alarm 1 Relay is not energized
Bit 2 1-Fault is normally energized 0-Fault is normally de-energized
Bit 1 1-Fault is latching 0-Fault is non-latching
Bit 0 1-Fault Relay is energized 0-Fault Relay is not energized
The following is a typical Master Query for device # 8:
Field Name HEX DEC RTU
Slave Address 08 8 0000 1000
Function 03 3 0000 0011
Start Address Hi 00 0 0000 0000
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 21 of 30
Start Address Lo 00 0 0000 0000
No. of Registers Hi 00 0 0000 0000
No. of Registers Lo 06 6 0000 0110
CRC ## #### ####
CRC ## #### ####
The following is a typical Slave Response from device # 8:
Field Name HEX DEC RTU
Slave Address 08 8 0000 1000
Function 03 3 0000 0011
Byte Count 0C 12 0000 1100
Reg40000 Data Hi 02 2 0000 0010
Reg40000 Data Lo 64 100 0110 0100
Reg40001 Data Hi 00 0 0000 0000
Reg40001 Data Lo 64 100 0110 0100
Reg40002 Data Hi 00 0 0000 0000
Reg40002 Data Lo 07 7 0000 0111
Reg40003 Data Hi 00 0 0000 0000
Reg40003 Data Lo 0A 10 0000 1010
Reg40004 Data Hi 00 0 0000 0000
Reg40004 Data Lo 14 20 0001 0100
Reg40005 Data Hi 05 5 0000 0101
Reg40005 Data Lo 50 80 0101 0000
CRC ## #### ####
CRC ## #### ####
Model 1000 H2S Echem
Additional Notes:
The calibration LED will light when the transmitter is sending a response to a Master Query. Communications
are 9600 baud, 8 data bits, 1 stop bit, No parity, and half duplex 485.
10.Display Contrast Adjustment
Detcon MicroSafe™ sensors feature a 16 character backlit liquid crystal display. Like most LCDs, character
contrast can be affected by viewing angle and temperature. Temperature compensation circuitry included in
the MicroSafe™ design will compensate for this characteristic; however temperature extremes may still cause
a shift in the contrast. Display contrast can be adjusted by the user if necessary. However, changing the
contrast requires that the sensor housing be opened, thus declassification of the area is required.
To adjust the display contrast, remove the enclosure cover and use a jeweler’s screwdriver to turn the contrast
adjust screw located beneath the metallic face plate. The adjustment location is marked “CONTRAST”.
11.Low Flow Fault Options
Model 1000 Analyzers offer two low flow fault option PCB’s. One monitors for low sample gas flow, and the
second monitors for low airflow dilution. The Low Flow Fault option for sample gas flow is usually set for
the relay contacts to fire at flow rates ≤ 100cc/min. The Flow Fault option for air dilution is usually set for the
relay contacts to fire at flow rates ≤ 300cc/min. These set points are factory set. Should it become necessary
to adjust the flow fault set points in the field, adjust the flow to the set point target (100 or 300cc/min.) at
rotameter(s) and adjust the potentiometer on the corresponding Low Flow Fault PCB until the fault LED
toggles between “ON” and “OFF”.
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 22 of 30
Model 1000 H2S Echem
12.Sensor Replacement
Should the electrochemical H2S plug-in sensor (part number 370-323200-000 or 370-3H3H00-000) require
replacement, use the following procedure:
1 - (A) If the sensor is mounted in a classified area, system power to the transmitter must first be removed
before proceeding further.
(B) If in an unclassified area, remove front enclosure cover and unplug transmitter module.
2 - Remove gas flow adapter and tubing connections to expose sensor housing.
3 - Unscrew the three screws of the sensor head bottom.
4 - Pull the sensor head bottom down and off.
5 - Grasp the electrochemical sensor cell and unplug by pulling down.
6 - Plug in the new sensor. Replace the sensor head bottom and screw in place.
7 - Re-attach gas inlet adapter and tubing connections.
8 - Restore system power (if classified) or plug in transmitter module and replace enclosure cover (if
unclassified).
9 - Perform a new zero and span calibration after 1-2 hours of warm-up time.
13.Troubleshooting
Reading higher or lower than anticipated
Probable cause: Incorrect sample flow or air flow, degraded cal gas, or needs to be zero and span calibrated.
1. Check for correct sample flow “S ” marking 200cc/min.
2. Check for correct air flow “” marking 500cc/min.
3. Check span gas is same as programmed AutoSpan value.
4. Check Span Calibration gas for valid concentration in nitrogen gas using H2S pull tube.
5. Re-calibrate sensors with known good span gas.
6. Re-zero sensor per instruction manual.
“Span Fault” Error
1. Check for correct calibration gas flow “C” marking, 250cc/min.
2. Check for correct air flow “” marking, 500cc/min.
3. Check Span Calibration gas for valid concentration in nitrogen gas using H2S pull tube.
4. Re-calibrate with known good span gas.
5. Consider electrochemical sensor replacement if reported Sensor Life is <50%.
Slow sensor response during Span Calibration
Probable cause: Incorrect sample flow or airflow, or bad span gas, or slow response sensor.
1. Check for correct calibration gas flow “C” marking, 250cc/min.
2. Check for correct air flow “” marking, 500cc/min.
3. Check Span Calibration gas for valid concentration in nitrogen gas.
4. Re-calibrate with known good span gas.
5. If problem persists, the sensor may need to be replaced. Contact factory.
Sample gas and/or air flow reduced, Flow Fault lights activated (optional)
Probable cause: Incorrect sample gas inlet pressure or the sample gas or airflow has been obstructed by,
blocked Genie membrane filter, failed air pump, vent lines blocked, rotameters accidentally turned down.
1. Check for liquid in the sample flow inlet line.
2. Check for adequate sample gas inlet pressure (10 ±2psig).
3. Check for obstruction in the air-inlet pump.
4. Open the Sample by-pass liquid rejection port to release any liquid trapped in the Genie Membrane filter.
Leave sample by-pass open to allow ~100-200cc/min of gas out.
5. Replace Genie membrane if permanently blocked.
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 23 of 30
14.Spare Parts
Part# Description
327-000000-000 Programming Magnet
351-152021-400 24 VDC Pump Assembly
360-2424AS-030 24V DC-DC Converter
943-200000-000 Activated Carbon Scrubber
360-205421-024 24 VDC Power Supply
943-010013-505 500 CC Fixed Flow Regulator
823-101085-882 Genie Membrane Filter
350-300000-000 0.5Lpm Rotameter no valve
348-900000-000 1Lpm Rotameter with valve
350-523081-02K Mass flow controller
955-004229-000 Bubbler Bottle Assembly
Model 1000 H2S Echem
Carbon Scrubber
Sample Flow Fault
Board (Optional)
Air Flow Fault
Board (Optional)
1.0 Lpm Air
Rotameter
Mass Flow Control
0.5 Lpm Sample
Rotameter
0-30 psi Pressure
Genie Membrane
Guage
Filter
Air Pump
Assembly
SAMPLE
FLOW
24VDC Power
AIR
FLOW
24V DC-DC
Converter
Supply
24VDC
+
10-30VDC
OUT
IN
1.25A
DCto DCConverter
PN360-2424TS-030
Optional
Bubbler
Bottle
DM-624
Transmitter
Module
H2S Sensor Head in SS Housing
H2S Plug-in Replacement Sensor
Figure 15 Analyzer Parts Identification
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 24 of 30
Model 1000 H2S Echem
Spare Parts DM-624 H2S Sensor
Part# Description
942-010212-XXX Calibration Span Gas (XXXppm H2S, balance nitrogen)
(Where XXX denotes the gas level – 010 = 10ppm, 025 = 25ppm, 050 = 50ppm)
942-010213-XXX Calibration Span Gas (XXX% H2S, balance nitrogen)
(Where XXX denotes the gas level – 001 = 1%, 1X5 = 1.5%, 2X5 = 2.5%)
926-245502-XXX Transmitter Module XXXppm Range (for H2S Alcohol Free gas sensor)
(Where XXX denotes the Range – i.e.: 005 = 0-5ppm, 010 = 0-10ppm,
020 = 0-20ppm, etc)
4040-H2S32-NXX Sensor Housing Assembly
(Where XX denotes Range – i.e.: N05 = 0-5ppm, N10 = 0-10ppm,
N20 = 0-20ppm, etc.)
404-0H2S3H-NXX Sensor Housing Assembly for High Range
(Where XX denotes Range – i.e.: N1K = 0-1000ppm, N5K = 0-5000ppm,
N1P = 0-1%, etc.)
017-501500-574 O-Ring 1.5”ID X 1.6”OD X 0.05”W
017-26530H-000 O-Ring 1 3/16”ID X 1 3/8”OD X 0.103”W
370-323200-000 Alcohol Free Replacement H2S Cell (used for ranges <1000ppm)
370-3H3H00-000 High Range H2S Cell (Used for ranges ≥1000ppm)
O-Rings
Condulet Cover with
Window
Plug in Transmitter Module
Connector Board
Sensor Housing Assembly
Condulet
Base
Replacement
Cell
Figure 16 DM-624 Replacement Parts
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 25 of 30
Model 1000 H2S Echem
15.Warranty
Detcon Inc., as manufacturer, warrants under intended normal use each new Model 1000 Series H2S Process
Analyzer gas detection system to be free from defects in material and workmanship for a period of one year
from the date of shipment to the original purchaser. All warranties and service policies are FOB the Detcon
Inc. facility located in The Woodlands, Texas.
Sensor Transmitter
Detcon, Inc., as manufacturer, warrants under intended normal use each new MicroSafe™ plug-in control
circuit to be free from defects in material and workmanship for a period of two years from the date of shipment
to the original purchaser.
Detcon, Inc., further provides for a five year fixed fee service policy wherein any failed transmitter shall be
repaired or replaced as is deemed necessary by Detcon, Inc., for a fixed fee of $65.00. The fixed fee service
policy shall affect any factory repair for the period following the two-year warranty and shall end five years
after expiration of the warranty. All warranties and service policies are FOB the Detcon facility located in The
Woodlands, Texas.
DM-624 Electrochemical H2S Sensor Element Warranty
Detcon, Inc., as manufacturer, warrants each hydrogen sulfide sensor cell (part no. 370-323200-000), for a 6month period under the conditions described as follows: The warranty period begins on the date of shipment to
the original purchaser and ends six months thereafter. The sensor cell is warranted free from defects in
material and workmanship. Should any sensor cell fail to perform in accordance with published specifications
within the warranty period, return the defective part to Detcon, Inc.
The original serial number must be legible on each sensor element base.
Shipping point is FOB the Detcon Factory.
Net payment is due within 30 days of invoice.
Detcon, Inc. reserves the right to refund the original purchase price in lieu of sensor replacement.
Terms & Conditions
The original serial number must be legible on each sensor element base.
Shipping point is FOB the Detcon factory.
Net payment is due within 30 days of invoice.
Detcon, Inc. reserves the right to refund the original purchase price in lieu of sensor replacement.
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 26 of 30
16.Flow Diagrams
Model 1000 H2S Echem
24VDC
+
10-30VDC
OUT
IN
1.25A
DCto DCConverter
PN360-2424TS-030
Sample Input
Vent Vent
SAMPLE
FLOW
AIR
FLOW
Sample Calibrate
Figure 17 Unit Flow Diagram
Vent
Span Gas
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 27 of 30
Model 1000 H2S Echem
Sample
Flow
Fault
Air Flow
Fault
Figure 18 Pump Box Flow Diagram
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 28 of 30
17.Wiring Diagram
Model 1000 H2S Echem
Red 18AWG
Black 18AWG
30
31
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
Blue 18AWG
Gray 18AWG
Violet 18AWG
Orange 18AWG
White 18AWG
+
24VDC
OUT
2.1A
Tan 18AWG
Brown 18AWG
Blue 18AWG
Black 18AWG
Green 18AWG
Yellow 18AWG
+
18-36
VDC
IN
Tan 18AWG
Gray 18AWG
White 18AWG
Brown 18AWG
Yellow 18AWG
40
41
Red 18AWG
Gray 18AWG
Gray 18AWG
Black 18AWG
Green 18AWG
Brown 18AWG
Brown 18AWG
Orange 18AWG
Orange 18AWG
Connector Board
32 33 34 35 36 37 38 39
40 41
Red 18AWG
Red 18AWG
Red 18AWG
Black 18AWG
Red 18AWG
Red 18AWG
Black 18AWG
Black 18AWG
Black 18AWG
Black 18AWG
24VDC +
24VDC Com
120VAC (L1)
Neutral (N)
Ground
DC IN
(Optional)
AC IN
Customer Supplied
Power Supply
Box Assembly
White 18AWG
Black 18AWG
Green 18AWG
Black 18AWG
P1
NFS40-7624
24VDC Power
26
J1
321Gnd
L1 N
Supply
+
+
123456
25
Green 16AWG
J1
Green 16AWG
Pump Box
Assembly
192021
123
Sample
Flow Fault
(Optional)
16
Fault
mA
A
B
A
B
VDC Power In
4-20mA Output
RS-485 In
RS-485 Out
Alarm Dry Contacts
38
39
18
17
1
2
Sensor
1112131415
COM
COM
COM
30
31
Red
Black
Pump
Assembly
34
35
Air Flow
Fault (optional)
33
32
123
Figure 19 Wiring Diagram
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 29 of 30
Appendix C
Revision
Date
Changes made
Approval
2.3
02/12/09
Previous Revision
2.4
09/04/09
Update Spare Parts
2.5
07/06/10
Update Spare parts to reflect High Range sensor , Added new
BM
2.606/02
/11
Updated drawings and Spare Parts List to show Detcon
LU
2.7
09/19/11
Updated notation for
V
DC input in section
3.3 to match wiring
LU
2.8
06/06/12
Added new range 0
-
1000ppm
BM
Revision Log
range (0-5%) to Sample Flow Rate tables
Aluminum condulet
diagram
Model 1000 H2S Echem
Shipping Address: 4055 Technology Forest Blvd., The Woodlands Texas 77381
Phone: 888.367.4286, 281.367.4100 • Fax: 281.292.2860 • www.detcon.com • sales@detcon.com
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 30 of 30
Mailing Address: P.O. Box 8067, The Woodlands Texas 77387-8067
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