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S2K
Flexible sampling system: continuous
or periodic sampling |
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MP Series
2+ channels: wall-mount, rack-mount,
and explosion-proof |
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LC-100
Single-channel, low cost, wall-mount
control unit |
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Sensor Transmitters
4-20 mA linear output |
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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 |
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Computerized Remote-Link System
8+ channels using a data highway |
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.
Fig. 2
1. External
pump delay: This is the time delay from the beginning
of the cycle before the external pump is activated.
During this time, the external pump is off.
The timer can be set from 0-255 minutes, with
a resolution of 1 minute.
2. External Pump Lead Time:
This is the amount of time the external pump
is "ON", before the solenoid valve is switched
to let the sample into the sensor chamber.
The timer can be set from 0-2550 seconds,
with a resolution of 10 seconds.
3. This is the amount
of time the solenoid valve is activated
to allow sample flow into the sensor chamber.
The timer can be set from 0-2550 seconds,
with a resolution of 10 seconds.
Each timer is set by an eight position
DIP switch with the following count values:
1 + 2 + 4 + 8 + 16 + 32 + 64 + 128 = 255.
This means that position one of the DIP switch
has a value of "1" while position 8 has a
value of "128". The time which is set for
the timer is calculated by taking the count
value and multiplying it by the resolution
of the timer. A time of zero is achieved by
having all of the switches in the open position.
There is a micro-switch which activates
a relay contact if there is a failure of the
flow into the sensor chamber. A calibration
switch with an LED indicator allows the user
to perform standard calibration functions
on the sensors. The S2K housing is designed
to be used with standard IST 4-20 IQ sensor
modules but other sensor modules (such as
the SM95) can be used also.
The S2K sampling system can
be configured with a variety of options. Fig.
3 illustrates the two-stage sampling system.
Figure 4 shows a complete system with a sample
diluting assembly. IST will assemble the system
to meet application requirements.
System Specifications:
Enclosure: NEMA 4X.
Dimensions: 345(H) x 292(W) x 127(D)
mm; (13.6"H x 11.5"W x 5.0"D).
Weight: 5.5 Kg (12 Lbs).
Timer controller function: See description
above.
Relay: SPST Normally Open, 5 amp resistive.
220 VAC max. 1/8 HP motor.
Three relays are provided
for the following:
1. No flow into
sensor chamber.
2. External pump
activation Relay.
3. Solenoid valve.
Internal Pump: Oscillating AC Diaphragm.
Replaceable.
Flow Meter: Dwyer Instrument, Inc. RMA-13-SSV.
Ranges as specified.
Power: 110/220 VAC, 50/60 Hz.
Temperature Range: -20oC to 50oC.
Humidity: Non-condensing. |
MP202 & 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 MP220EX can 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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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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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
VDC power, 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
bead, or electrochemical.
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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 ALARM 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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The window above is from WinRL, the new Windows NT version of
the 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
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