Detcon 1000 Manuel utilisateur

Detcon Model 1000

H2S Process Analyzer - Electrochemical Sensor

INLET

SAMPLE

10 PSIG (CONSTANT)

SAMPLE PRESSURE

INLET

AIR AIR

INLET

SAMPLE OUTLET

SAMPLE

FLOW AIR

FLOW

MODEL NO.

SERIAL NO.

INPUT VOLTAGE

FREQUENCY

CURRENT LOAD

AREA CLASSIFICATION

detcon inc.

3200 A-1 Research ForestDr.

The Woodlands, TX 77381

www.detcon.com

PART NO.

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

May 3, 2018• Document #2945• Revision 2.9

Model 1000 H2S Echem

Model 1000 H2S Echem Instruction Manual ii

This page left intentionally blank

Model 1000 H2S Echem

Model 1000 H2S Echem Instruction Manual iii

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 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

Model 1000 H2S Echem Instruction Manual iv

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 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

Mailing Address: P.O. Box 8067, The Woodlands Texas 77387-8067

Phone: 888.367.4286, 281.367.4100 • Fax: 281.292.2860 • www.detcon.com • sales@detcon.com

Model 1000 H2S Echem

Model 1000 H2S Echem Instruction Manual Rev. 2.9 Page 1 of 30

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.

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” 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” 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 DM-

624 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

Model 1000 H2S Echem Instruction Manual Rev. 2.9 Page 2 of 30

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 a 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.

NOTE: This particular sensor cell is unique in that it has no cross-sensitivity to alcohol vapors

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

Model 1000 H2S Echem Instruction Manual Rev. 2.9 Page 3 of 30

Figure 3 Functional Block Diagram

Figure 4 DM-624 Control Circuit

1.4 Base Connector Board

The base connector board is mounted in the 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

Model 1000 H2S Echem Instruction Manual Rev. 2.9 Page 4 of 30

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 Enclosures

The sensor is packaged in a cast metal 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.

24VDC

OUT

2.1A

18-36

VDC

Flow Fault (optional)

Pump/Scrubber Power Supply/

Terminal PCB Sensor (side view) Sensor

Right

Left

Figure 6 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 enclosure. The pump and optional low flow fault assemblies are located in

the upper left enclosure.

Model 1000 H2S Echem

Model 1000 H2S Echem Instruction Manual Rev. 2.9 Page 5 of 30

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

Non Hazardous Area

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

Model 1000 H2S Echem Instruction Manual Rev. 2.9 Page 6 of 30

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.

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