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S2K
Flexible sampling system: continuous or periodic sampling
S2K Flexible Sampling System
Model S2K Sampling System offers the following flexible features:
- Basic continuous sampling
- Basic periodic sampling with user adjustable time interval
- Sample dilution to allow sensors to monitor very high gas concentrations
- Timer-controlled external bypass pump which improves sampling time, simplifies sample filtration requirements, and reduces pump maintenance
- Provide viable solution for difficult applications
Description:
The IST model S2K Sampling System is a flexible sampling system which is designed to condition the sample as required. This system not only brings the sample to the sensor, in many cases, it is the only viable solution to difficult applications. For instance, in applications where the sample concentration is too high for the sensor, the model S2K's ability to dilute samples allows the sensor to be exposed to the sample and provide an accurate reading. Another advantage of non-continuous sampling is the fact that the zero point is confirmed on every reading which increases the confidence level of the measurement. Fig. 1 illustrates phosphine gas diluted at a 5:1 ratio measured on a solid state sensor.
Functions:
The S2K controls the following functions:
1. A 3-way solenoid valve: A DIP switch is used to set the amount of time the sample is to be exposed to the sensor. The rest of the time the sensor is exposed to clean air.
2. An external pump control timer which sets the on-off time of the pump. The purpose of the external pump is to transport the sample in larger quantities which shortens the transport time. Additionally, it is easier to draw a controlled amount of sample to be conditioned before exposing it to the sensor. The timer turns the pump on only as needed which prolongs the pump life and reduces pump maintenance.
3. A smaller, internal pump is on constantly to flow either sample or clean air to the sensor.
There are three timers required to implement the complete cycle as shown in Fig. 2 below.
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MP Series
2+ channels: wall-mount, rack-mount, and explosion-proof
MP SERIES STATIONARY INSTRUMENTS
2-Channel MP202 and 4-Channel MP204 Wall-Mounted
The MP202 and MP204 are wall-mounted, microprocessor-based control units housed in weatherproof enclosures. The MP202 is a two-channel controller which can be used for 1 or 2 sensor channels, while the MP204 is a four-channel controller which can be used for up to 4 sensor channels. A front door keypad enables convenient operation of the controller without the need to open the enclosure. Standard features include: 3 alarm setpoints per channel, digital display per channel, common relays (optional individual relays), operates on 110/220 VAC (autoswitching), and 24 VDC power supply to power sensor transmitters. Both the MP202 and MP204 can be used with either our standard sensor transmitter (SM95) or our intelligent sensor transmitter (4-20IQ).
MP24 RACK/PANEL MOUNTED
The MP24 is a rack/panel-mounted version of the MP202. It is a compact control unit which accepts 1 or 2 sensor channels. Up to 12 of these control units will fit into a standard 19" rack or panel space, for a total of 24 sensor channels. Standard features include: 3 alarm setpoints per channel, digital display per channel, choice of individual or common relays, and choice of operating voltages (110/220 VAC or +24VDC). The MP24 can be used with either our standard sensor transmitter (SM95) or our intelligent sensor transmitter (4-20IQ). Please see below for details.
MP220EX EXPLOSION-PROOF
The MP220EX is a two channel, explosion-proof, wall mounted, control unit rated for use in Class 1, Div. 1, Groups C & D (B optional) hazardous areas. Operation via magnetic wand allows the unit to be operated without opening the cover, thereby ensuring that hazardous areas do not require declassification. Standard features include: 3 alarm setpoints per channel, digital display per channel, common relays (optional individual relays), operates on 110/220 VAC (autoswitching), and 24 VDC power supply to power sensor transmitters. The MP220EXcan be used with either our standard sensor transmitter (SM95) or our intelligent sensor transmitter (4-20IQ). Please see below for details.
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LC-100
Single-channel, low cost, wall-mount control unit
LC-100 SINGLE-CHANNEL CONTROL UNIT
The LC-100 is a stationary, single-channel, wall-mounted control unit for the detection of over 150 different toxic and combustible gases for area air quality and safety applications. The LC-100 can be used with many sensor technologies including Solid State, Electrochemical, Catalytic Bead, Infra-red, and more! A Solid State sensor can be self-contained inside the NEMA enclosure, or any sensor type can be used in conjunction with IST's standard sensor transmitter (SM95 )or intelligent sensor transmitter (4-20IQ) for use in classifed areas (UL and CSA Classified for Class I, Div. 1, Groups B, C, and D).
- Wall-mounted NEMA 4X Weatherproof Enclosure
- Dual Alarm LED's and relays. Optional failsafe or latching relays
- Optional 4-20 mA output
- Digital LED Display
- Easy and economical to use
TYPICAL APPLICATIONS FOR THE LC-100:
CARBON MONOXIDE MONITORING FOR BREATHING AIR SYSTEMS (MODEL LC-100-BCO)
- Includes a Solid State sensor with a 3 year sensor warranty
- Meets OSHA requirements for supply air monitoring
- Specially designed sensor and system for compressed breathing air
- Simple, reliable, durable, and economical
- Alarm points user settable (typically 10 PPM low alarm and 30 PPM high alarm)
- High-pressure (120 psi) and low-pressure inputs
LEAK DETECTION FOR REFRIGERANTS
- Can be outfitted with either Solid State or Electrochemical sensor for ammonia detection
- New HydroFluoroCarbons (HFC's) can be detected with Solid State sensors
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Sensor Transmitters
4-20 mA linear output
4-20 IQ INTELLIGENT TRANSMITTER
The model 4-20 IQ is a microprocessor based intelligent sensor transmitter. It comes equipped with a digital display which provides a local reading of the gas concentration. Operating on 14-24 VDCpower, it provides a linear 4-20 mA output proportional to the gas concentration, and is housed in an explosion-proof casing. The 4-20 IQ has been UL Classified and CSA Approved Class I, Div. 1, Groups B, C, and D. The 4-20 IQ can operate as a stand-alone instrument, or it can be used with an IST control unit to provide control room readings and alarm relays.
The 4-20 IQ come equipped with an automated calibration feature which allows the unit to be calibrated without manually adjusting any potentiometers. Just apply gas and the 4-20 IQ will do the rest. It couldn't be easier! Interfacing with the 4-20 IQ is accomplished by using a magnetic wand to activate magnetic switches located on the front panel. Thus, all functions can be performed with removing any covers, meaning there's no need to declassify an area being monitored. The 4-20 IQ can be used with any of IST's sensor technologies: infra-red (IR), solid state, catalytic bead, or electrochemical.
SM95 STANDARD TRANSMITTER
The model SM95 sensor transmitter is housed in an explosion-proof casing and operates on 14-24 VDC power. The SM95 has been UL Classified and CSA Approved Class I, Div. 1, Groups B, C, and D. The SM95 provides a 4-20 mA linear output proportional to the gas concentration and is calibrated by adjusting potentiomenters located inside the housing. The SM95 can operate as a stand-alone instrument, or it can be used in conjunction with any of IST's complete line of control units which provide control room readings and alarm relays. When used with any of IST's MP Series control units, automated calibration is provided, enabling calibration without the need to adjust potentiometers. Like the 4-20 IQ, the SM95 can be used with any of IST's sensor technologies: infra-red (IR), solid state, catalytic
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Transmitters Relay Contact
provides one Single-Pole, Double-Throw relay contact and a seven-segment DIP switch to program the relay to trip at a designated value within the 4-20 mA signal range
TRANSMITTER RELAY CONTACT: TR-98
General
Sensor transmitters typically provide a 4-20 mA output, and this signal can be fed to a controller which provides alarm processing and relay contacts to trip alarm horns/lights, activate ventilation motors, etc. However, some applications require relay contacts to be located at the sensor transmitter itself. For these applications, the TR-98M Transmitter Relay provides a simple solution. Even though it is designed for IST transmitters, it will also work with other transmitters which produce a 4-20 mA signal.
The TR-98M (master) incorporates a conduit fitting which enables it to attach directly to either the SM95 or 4-20IQ transmitter, and provides one Single-Pole Double-Throw (SPDT) relay contact. A seven segment DIP switch allows you to program the relay to trip at a designated value within the 4-20 mA signal range. If additional relay contacts are needed, the TR-98S (slave), a slave relay module, can be added. Up to four TR-98S units can be added, providing a total of five relay contacts.
Both the TR-98M and TR-98S are housed in explosion-proof enclosures rated for use in Class 1, Division 1, Groups B,C and D hazardous areas.
Setting the Alalrm Set Point
A seven-segment DIP switch (S1) is used to set the alarm point from 1% to 100% of full scale. Each switch has the following values when in the OPEN position.
1 = 1%, 2 = 2%, 3 = 4%,
4 = 8%, 5 = 16%, 6 = 32%,
and 7 = 64%
Switch positions are clearly marked on the DIP switch package.
The alarm set point is the sum of the values in the OPEN position. For instance, for an alarm set point of 20% of full scale, switches 3 and 5 should be in the OPEN position while the rest of the switches should be closed. This yields S3 (4%) + S5 (16%) = 20%. With a 4-20 mA output, this would mean an alarm set at 7.2 mA.
Relay Specifications
Single-Pole, Double-Throw, 5A at 117VAC resistive.
Optional Connections
Using a jumper connection, the TR-98M gives the user the option to have the relay operate in either Normal or Fail-Safe mode.
Normal mode: The relay makes contact as the signal reaches the set point and turns off when the alarm condition disappears.
Fail-Safe mode: The relay is energized at all times. The relay is de-energized (activated) if the signal reaches the alarm set point or if there is a 24VDC power failure. Since relays are always energized, this configuration consumes more power. Note also that relay output connections are reversed, so that Normally Open connections become Normally Closed.
Unless specified, all TR-98 modules are shipped with relays in Normal mode.
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Computerized Remote-Link System
8+ channels using a data highway
Computerized Remote-Link System
- Data highway eliminates individual sensor wiring, producing significant savings in installation costs
- Modular design enables easy future expansion
- Can handle systems requiring 100 or more sensors
- Graphic display shows sensor locations within your facility and pinpoints alarms
- State-of-the-art sotware features data archiving, curve plotting, TWA reports, alarm processing, foreign language support, and much more
The Remote-Link System is a state-of the are, computer -controlled, gas monitoring system which allows sensors to communicate with the Remote-Link Computer over a data highway - eliminating the individual sensor wiring associated with conventional monitoring systems. The Remote-Link's powerful monitoring software includes such features as data archiving and reporting, curve plotting, alarm processing, and fault monitoring. Additionally, a graphics display shows a drawing of your plant and the locations of a ll the sensors within your plant. By using the mouse button to point and click a sensor, you can view it's current reading and alarm status. A separate screen allows you to view the readings of all sensors simultaneously. When an alarm occurs, audible and visual indications are provided on the computer screen, and the graphics display will pinpoint the area where the alarm is occuring. Alarm relays are also activated to trip horns, lights, etc. Alarm relays are fully programmable and each relay can be assigned to a single sensor or group of sensors.
The Remote-Link System can accommodate hundreds, even thousands, of sensors, yet it is still an economical choice for systems with as few as 8 sensors. The modular design of the system enables additional sensors to be added with ease at a low incremental cost, allowing you to expand the system according to your needs. Computer assisted calibration takes the hassle out of calibration. Zero every sensor in the system with one press of a button. Then, simply apply gas to each sensor and let the computer do the rest. Calibration just doesn't get any easier than this!
The Remote-Link Sytem is extremely versatile and can be configured any number of ways to suit virtually any application. It's design allows it to accommodate any size facility, and multiple display screens can be provided. Additionally, each Remote-Link Computer is equipped with an internal modem which allows IST to provide on-line support whenever necessary. The Remote-Link System can be used with either our standard sensor transmitter (SM95), our intelligent sensor transmitter (4-20IQ), or sensor transmitters from other manufacturers.
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