MP-7217-TC Sensor Datasheet

MP-7217-TC Datasheet, PDF, Equivalent


Part Number

MP-7217-TC

Description

Combined Flammable and Volume Percent Methane Sensor

Manufacture

SGX

Total Page 3 Pages
Datasheet
Download MP-7217-TC Datasheet


MP-7217-TC
MP-7217-TC Combined Flammable and
Volume Percent Methane Sensor
The MP-7217-TC gas sensor has been designed to measure
Methane over the explosive concentration range and up to
100% by volume.
The explosive range is measured with the sensor in Catalytic
mode where the target gas is reacted on the detector bead.
The 100% volume range is measured with the detector bead
replaced by a resistor and the compensating bead measuring
the target gas concentration by virtue of its change in thermal
conductivity.
The sensor also contains an externally digital controllable on-
board switch, facilitating the change from the catalytic mode
to thermal conductivity mode and back again.
An on- board temperature sensor also provides a temperature
output to allow an instrument microprocessor to carry out
temperature compensation.
SENSOR FEATURES
Dual Range i.e. Methane 0-100% LEL; 0-100% Vol.
Single sensor footprint
Very low power
Highly silicon poison resistant
Highly H2S resistant
Mechanically robust to shock
Low orientation effects
High quality silicon wafer manufacture
2 Hanbury Road
Chelmsford
Essex
CM1 3AE
United Kingdom
.
T: +44 (0)1245-809110
F: +44 (0)1245-809112
E: sales.is@sgxsensortech.com
www.sgxsensortech.com
INTERFACE DIAGRAM
OPERATION
It is recommended that the detector and
compensator be run in a simple Wheatstone bridge
circuit at a constant voltage.
The output of the temperature sensor should be used
to compensate for ambient temperature changes
particularly in the case of operating in TC mode.
It is recommended that the changeover switch from
Catalytic to Thermal conductivity is software controlled
e.g. switching off the catalytic mode when the gas
concentration exceeds 60% LEL and switching off the
TC mode when the Methane concentration drops below
50%LEL.
CERTIFICATION
MP-7217-TC
MP-7217
Uncertified
ATEX / IECEx / UL
(See MP-7217 Datasheet for more information)
The interface PCB is currently uncertified for use in
explosive atmospheres. It is anticipated that the design of the
interface PCB is incorporated into the design of the
instrument. The sensing element MP-7217 is certified as
explosion proof (Ex d and Ex ia).
_________________________________________________________________________________________________
Whilst SGX Sensortech has taken care to ensure the accuracy of the information contained herein it accepts no responsibility for the cons equences of any use thereof and also reserves
the right to change the specification of goods without notice. SGX Sensortech accepts no liability beyond the set out in its standard conditions of sale in respect of infringement of third
party patents arising from the use of tubes or other devices in accordance with information contained herein.
In case of modification of the product, SGX disclaims all liability.
SGX Sensortech(IS) Ltd Registered in England No.08067077
DS-0152, Issue 2, 16-Jan-2015

MP-7217-TC
2 Hanbury Road
Chelmsford
Essex
CM1 3AE
United Kingdom
T: +44 (0)1245-809110
F: +44 (0)1245-809112
E: sales.is@sgxsensortech.com
www.sgxsensortech.com
GENERAL DATA
This information relates to the device operating continuously in
the recommended bridge circuit.
Operation…………………………………………………Continuous
Supply voltage (see note 1)……………….……………..2.9 to 3.1V
Sensor current (at 3.0 ± 0.1V)…………. ………………39 to 42mA
Typical Sensitivity Methane
(Measured using 1% Methane balance air test gas)
Catalytic mode…………………………………..12 mV / % Methane
TC mode……………………………….…. ……..3 mV /% Methane
Zero offset range in clean air
(at 3.0 ± 0.1V)
Catalytic mode……………………………………………. ± 20 mV max
TC mode……………………………….…. ………….. ± 50 mV max
Response times (t90) (see note 2)
Catalytic mode……………………………………………. < 12 seconds
TC mode………………………………….. ………….. < 10 seconds
Maximum Gas concentration (see note 3)
Catalytic mode…………………………. 5% volume Methane in Air
TC mode……………………….. ………….. 100% volume Methane
Long Term Behaviour
Catalytic
Long Term Zero drift (see note 4)……………. …..< 1.0 mV/month
Long Term Sensitivity drift (see note 5)………….< 0.6 mV/month
TC mode
Long Term Zero & Sensitivity drift: Customer dependent;
compensation method used.
Temperature and Linearity
Catalytic: Linear up to a minimum of 4% Methane
TC Mode: See below for Linearity and effect of temperature
EN60079-29-1 2007 part 5.4.3.2 i.e. within ±3% Methane or
±5% of indication.
MAXIMUM RATINGS (Absolute values)
Input voltages between pins 2 and 3………………….……….3.2 V
Operation, storage in original packaging and shipping:
Temperature…………………………………………….-40 to +60 °C
Humidity………………………………..0 to 95%RH non-condensing
NOTES
1. The polarity of the supply voltage may be reversed
without harm. The only effect is to reverse the polarity of
the output signal.
2. Responses measured at 3.0 ± 0.1 V using 1% Methane
in an SGX test manifold at 500 SCCM.
3. Exceeding these limits may change the sensitivity to
Methane or the zero in air or in extreme cases
permanently damage or destroy the sensor. The
calibration of the sensor should be re-measured if the
sensor voltage has exceeded 3.2 Volts.
4. Whilst op eratin g, to g a s concentrations greater than
the Lower Explosive Limit.
5. Over 90 days period. Measured at 3.0 ± 0.1 V using 1%
methane, over a 90 days period.
IMPORTANT PRECAUTIONS
Read the following instructions carefully before using the
MP-7217TC described in this document to avoid erroneous
readings and to prevent the device from permanent
damage.
Some compounds are known to have detrimental effects on
the response of catalytic detector bead to gas.
I. Long term exposure to silicones (by far the most significant
poison), hydrogen sulfide (other sulfur containing
compounds), phosphates and organometallic compounds
will irreversibly poison the sensor. High concentrations of
flammable gas could also permanently affect the
response of the sensor in catalytic mode.
II. Long term exposures to Hydrogen Sulfide can cause
temporary or permanent loss of catalytic sensor response.
Other vapours such as Halogenated hydrocarbons (e.g.
freon, trichloroethylene, methyl chloride,), can cause the
same type of effect to a lesser degree.
III. Specific protection is needed in applications where poisons
or inhibitors are present.
SGX strongly recommends using ESD protection
equipment to handle the sensor. For any additional questions,
contact SGX.
The responses exhibit a quadratic behavior and tests have
shown that a 3 point calibration at 0, ~40 & 100% Methane will
generate factors which will meet the requirements of
_________________________________________________________________________________________________
Whilst SGX Sensortech has taken care to ensure the accuracy of the information contained herein it accepts no responsibility for the cons equences of any use thereof and also reserves
the right to change the specification of goods without notice. SGX Sensortech accepts no liability beyond the set out in its standard conditions of sale in respect of infringement of third
party patents arising from the use of tubes or other devices in accordance with information contained herein.
In case of modification of the product, SG X disclaims all liability.
SGX Sensortech(IS) Ltd Registered in England No.08067077
DS-0152, Issue 2, 16-Jan-2015


Features MP-7217-TC Combined Flammable and Volume Percent Methane Sensor The MP-7217-TC gas sensor has been designed to measure Methane over the explosive concentrati on range and up to 100% by volume. The explosive range is measured with the se nsor in Catalytic mode where the target gas is reacted on the detector bead. T he 100% volume range is measured with t he detector bead replaced by a resistor and the compensating bead measuring th e target gas concentration by virtue of its change in thermal conductivity. Th e sensor also contains an externally di gital controllable onboard switch, faci litating the change from the catalytic mode to thermal conductivity mode and b ack again. An on- board temperature sen sor also provides a temperature output to allow an instrument microprocessor t o carry out temperature compensation. S ENSOR FEATURES  Dual Range i.e. Meth ane 0-100% LEL; 0-100% Vol.  Single sensor footprint  Very low power  Highly silicon poison resistant  Highly H2S resistant  M.
Keywords MP-7217-TC, datasheet, pdf, SGX, Combined, Flammable, and, Volume, Percent, Methane, Sensor, P-7217-TC, -7217-TC, 7217-TC, MP-7217-T, MP-7217-, MP-7217, Equivalent, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute




@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)