RKI SD-1 Series
SD-1 Series Combustible Gas and Organic Vapor Detector / Transmitter
Features
- Wide range of detectable gases
- % LEL Combustibles, catalytic
- % LEL Combustibles, IR
- H2S, CO, & O2
- PPM for acrylonitrile, ethylene oxide, n-methyl pyrolidone, methylene chloride, and many others
- Sensor types include
- Catalytic, Galvanic Cell, MOS, IR, & Electrochemical
- Direct digital display of gas readings
- HART communication protocol
- HART over 4-20mA or 4-20mA linear output
- Available with SIL2 approval (IR, EC, OX versions)
- Easy maintenance using a magnetic key
- Self-diagnosis by microprocessor
- Low power operation (Maximum: 3W)
- Explosion proof: ATEX, IECEx, ExdIICT5
SD-1 Product Datasheet [PDF]
SD-1 Operating Manual [PDF]
RKI Instrument’s model SD-1 Series smart combustible gas, toxic gas, oxygen, and organic vapor detector/transmitter is a robust and reliable explosion proof design for detecting LEL and ppm levels of hazardous atmospheres. 
In addition to measuring the common %LEL levels of methane, hexane and isobutane, for example, the SD-1 Series also has the capability of measuring a wide variety of toxic organic compounds in a PPM range such as acrylonitrile, ethylene oxide, n-methyl pyrolidone, methylene chloride and many others. This gives the SD-1 Series a unique niche in RKI’s gas detector line-up. The SD-1 has an ATEX/IECEX approval for the explosion class ExdIICT5 and has an IP-65/67 ingress protection rating.
The SD-1 has a 4-20mA signal output as well as relay contacts for interfacing with other control systems or monitoring facilities. All SD-1 types are also available with HART communication instead of 4-20mA relay. SIL2 is available for the IR, EC and OX types. In facilitating non-intrusive conditions in hazardous atmospheres, the SD-1 can be calibrated and it’s menus navigated with magnetic switches and a magnetic key.
Related Services
- Design, Consultations, and Engineering
- Installation
- Start-up
- Training
- System Maintenance
Applications
- LNG Terminal
- Petrochemical/Chemical plants
- Power plant
- Utilities
- Iron and steel works
Specifications
| Model | SD-1GP |
SD-1RI |
SD-1GH |
SD-1EC |
SD-1OX |
| Detection Principle | Catalytic | Infrared | Semiconductor | Electrochemical | Galvanic Cell |
| Measuring gas | Variety of hydrocarbons | See chart below | CO/H2S | Oxygen | |
| Measuring range | 0 -100% LEL | CO: 0-75ppm H2S: 0-30ppm |
0 -25 vol% | ||
| Alarm setting | Two fully programmable alarm set points, increasing / decreasing, latching /
self resetting, on delays, off delays, normally energized or de-energized |
||||
| Sampling Method | Diffusion (Flow adapter and air aspiration available) | ||||
| Display | 4 digit Digital LED | ||||
| Output | 4-20 mA, HART (optional) | ||||
| Relay | 1 Relay with 4-20 mA versions or No relay with HART versions | ||||
| Alarm contacts | Normally open or normally closed | ||||
| Contact capacity | 30 VDC 0.5A or 120 VAC 0.5A (load resistance) | ||||
| Fail alert Self diagnosis | Circuit failure / Sensor failure | ||||
| Fail alert display | Fail lamp (Yellow) | ||||
| Power source | 24VDC (17VDC ~ 26.4VDC) | ||||
| Operating Temperature & humidity | -4 ~ + 140°F / below 95% RH (non condensing) [-20 ~ + 60°C], (SD-1EC Below 80% RH) | ||||
| Dimension & Weight | 5.8”(W) x 6.3”(H) x 3.5” (D) , Approx. 4.4 lbs [148(W) x 161(H) x 88(D) mm, Approx. 2.0kg] | ||||
| Approvals **Applied to SD-1GP for H2, CH4, i-C4H10, C3H8 |
Exd II CT5,ATEX ** | CML 15ATEX1034IECEX, SIL | Exd II CT5,ATEX, IECEx | DEKRA 13ATEX0035IECEx DEK 13.0024X | |
SD-1GH Detectable Gases & Measuring Ranges |
|||||||||||
| Detection Gas | Formula | Full Scale Ranges | TLV-TWA
(ppm) |
LEL | Detection Gas | Formula | Full Scale Ranges | TLV-TWA
(ppm) |
LEL | ||
| Low
(ppm) |
High
(ppm) |
Low
(ppm) |
High
(ppm) |
||||||||
| Acetic acid | C2H4O2 | 500 | 3000 | 10 | 4.0 | R-12 | CHCIF2 | 300 | 5000 | 1000 | – |
| Acetone | C3H6O | 100 | 10000 | 500 | 2.15 | Hydrogen | H2 | 200 | 10000 | – | 4.0 |
| Acetylene | C2H2 | 200 | 3000 | – | 1.5 | Hydrogen Specific | H2 | 200 | 2000 | – | 4.0 |
| Acrylonitrile | C3H3N | 500 | 1000 | 2 | 2.8 | Hydrogen sulfide | H2S | 20 | 100 | 1 | – |
| Ammonia | NH3 | 500 | 1000 | 25 | 15 | Isopropyl alcohol | C3H8O | 300 | 5000 | 200 | 2.0 |
| Benzene | C6H6 | 200 | 2000 | 0.5 | 1.2 | Methane | CH4 | 2000 | 100%LEL | – | 5.0(CH4) |
| Buthylacetate | C6H12O2 | 100 | 5000 | 150 | 1.4 | Propane | C3H8 | 2000 | 100%LEL | – | 2.0(C3H8) |
| Buthylacrylate | C7H12O2 | 50 | 1000 | 2 | 1.5 | Methyl alcohol | CH3OH | 100 | 5000 | 200 | 5.5 |
| n-Buthyl alcohol | C4H10O | 100 | 5000 | 400 | 1.4 | Methyl bromide | CH3Br | 200 | 1000 | 5 | 8.6 |
| Chloroform | CHCL3 | 200 | 5000 | 10 | – | Methyl ethyl ketone | C4H8O | 30 | 5000 | 200 | 1.8 |
| Cyclohexane | C6H12 | 200 | 5000 | 100 | 1.3 | Methyl isobutyl ketone | C6H12O | 50 | 500 | 50 | 1.2 |
| Cyclohexanone | C6H10O | 50 | 1000 | 20 | 1.1 | Methylene choride | CH2CI2 | 500 | 5000 | 50 | 13.0 |
| 2-ethoxyethyl acetate | C6H12O3 | 100 | 3000 | 5 | 1.7 | n-Hexane | n-C6H14 | 100 | 5000 | 50 | 1.2 |
| Ethyl acetate | C4H8O2 | 100 | 5000 | 20 | 2.1 | Tetrahydrofuran | C4H80 | 20 | 3000 | 100 | 1.2 |
| Ethyl alcohol | C2H5OH | 100 | 5000 | 1000 | 3.3 | Toluene | C7H8 | 20 | 3000 | 100 | 1.2 |
| Ethylene | C2H4 | 200 | 5000 | 200 | 2.7 | Trichloroethylene | C2HCl3 | 300 | 5000 | 50 | 7.9 |
| Ethylene oxide | C2H4O | 100 | 1000 | 1 | 3.0 | Vinyl chloride | C2H3Cl | 200 | 3000 | 5 | 3.8 |
| R-11 | CCI3F | 2000 | 5000 | 1000 | – | Xylene | C8H10 | 100 | 2000 | 100 | 1.0 |
