Qel QTS-1710 SERIES User manual

MODEL QTS-1710 SERIES
COMBUSTIBLE GAS
TRANSMITTER/SENSOR
INSTALLATION
OPERATION AND MAINTENANCE
MANUAL
QUATROSENSE ENVIRONMENTAL LTD.
5935 OTTAWA STREET, PO BOX 749 RICHMOND, ONTARIO CANADA K0A 2 0
PHONE: [phone] FAX: [phone]
Web: www.QELsafety.com Email: [e-mail]

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TABLE OF CONTENTS
1. GENERAL SPECIFICATIONS ...............................................................................................................3
2. INSTALLATION ..........................................................................................................................................3
3. FILTERS AND SENSOR POISONS .......................................................................................................4
3.1 P OISON R ESISTANT S ENSORS ........................................................................................................................5
3.2 F ILTERS .............................................................................................................................................................5
4. CALIBRATION PROCEDURES .............................................................................................................5
5. CALIBRATION WITH METHANE STANDARD GAS FOR OTHER COMBUSTIBLE
GASES. ............................................................................................................................................................
5.1 C ONVERSION F ORMULAE : .............................................................................................................................7
5.2 C ALIBRATION G ASES ......................................................................................................................................7
. WIRING ..........................................................................................................................................................7
7. REMOTE SENSOR HEAD MOUNTING .............................................................................................8
7.1 WIRING ..............................................................................................................................................................8
7.2 CALIBRATION .....................................................................................................................................................8
8. WARRANTY STATEMENT .....................................................................................................................9

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QTS-1710 TRANSMITTER/SENSOR
1. GENERAL SPECIFICATIONS
Power Supply 24 VDC
(12 to 30 VDC)
125 mA Max
80 mA typical
Signal 4 - 20 mA Linear
0 - 100% LEL
Wiring 3 wires: Power (+)
Signal
Common (-)
Max. Signal Load (Burden resistance)
700 Ohms at 24 VDC
500 Ohms at 20 VDC
200 Ohms at 12 VDC
Hazardous Locations Enclosures:
Expl. Proof: CL1. Div 1, Gr. A, B, C, D
CSA, FM, ATEX Approval
Temperature -40 C to +50 C (-40 F to +122 F)
Humidity 0 - 99 % RH (Non- Condensing)
Calibration recommendation: every 90 days max.
* Please allow 24 hours warm-up time period before calibrating
2. INSTALLATION
Sensor orientation should be pointing downwards.
Mounting height is dependent upon whether a gas is heavier or lighter than air: Methane (natural gas),
Hydrogen and Ammonia are lighter than air, sensors should be placed close to the ceiling. Most other
combustible gases are heavier than air and the sensor should be placed close to the floor.
Take note of any barriers, which may cause the gas to collect. Note likely sources of gas and place the
sensors near them.
Figur 1 Conn ction and Adjustm nts

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Procedure Remove electronics module for pulling wires and reinstall for connection. Undo
the centre nut and disconnect the sensor wire from the jack. Pull outward.
3. FILTERS AND SENSOR POISONS
Catalytic bead sensors such as are used in these instruments are subject to certain poisoning effects from
some gases. Some gas classes, notably silicones are permanent poisons: they coat the surface of the
sensor, preventing the sensor from interacting with the hydrocarbon gases being measured. There is no
"cure" for sensors poisoned with silicones.
There are other gases which have similar effects, but which are to some degree reversible. These are
Chlorinated solvents, sulphur based products and some others. The symptoms are the same, in that the
sensor becomes non-responsive; however, it is possible to "burn off" the coating by applying an
"overdose" by, for instance a short exposure to pure butane. The procedure is always slightly damaging to
the sensor, so it should not be done indiscriminately, and the sensor should be recalibrated afterwards.
It is important to note that THE ONLY WAY TO DETERMINE WHETHER A SENSOR IS POISONED
Figure 2 Enclosure Access

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IS TO APPLY A TEST GAS.
3.1 Poison Resistant Sensors
QEL uses improved catalytic bead sensors, which are very resistant to poison of this sort; however, they
are not proof against poisons and should be tested regularly.
3.2 Filters
QEL has instituted the use of poison filters of activated charcoal impregnated cloth. These supply good
protection against most poisons; however, they are not proof against poisons and should be changed
regularly in an area known to have poisons present. When installing be certain that the filter presses
firmly up against the flame arrestor face.
Activated charcoal filters may not be used when the gas being tested is of a type which will be absorbed
by the filter. General use for methane and Hydrogen detection, use with propane detection is
recommended for non hazardous area such a parking garages, as the response time may be slowed.
Figur 3 S nsor H ad Ass mbly
4. CALIBRATION PROCEDURES
Equipment: Digital Multimeter c/w Pos and Neg probes with:
a) 20.0 mA scale
b) 200 mV scale
Source of clean air
Source of appropriate span gas (usually 40 - 50 % LEL, Balance air)
Small adjustment screwdriver.
Clean air adjustments:
1. If sensor is NEW, pull out electronics module slightly and measure voltage between NULL
testpoints TP3 & TP5 (use 200 mV scale) and adjust NULL to get 000.0 mV. (See Figure 1.)
2. Set multimeter to 20 mA scale, attach probes, and insert Pos probe to "POS" jack, Neg probe to

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"SIG" jack. If Transmitter is connected to a QEL controller, insert Neg probe into "COM" jack to
avoid fault condition. Adjust ero to get 4.00 mA in clean air.
Span Adjustments:
3. Multimeter still attached as in (2) apply appropriate calibration gas to sensor and adjust SPAN to
read appropriate signal on the multimeter.
4. Wait 2 or 3 hours and check (2) and (3) again, if required.
Conversion Formula:
Signal(mA) = Conc.(% LEL) x 16 + 4
100
5. CALIBRATION WITH METHANE STANDARD GAS FOR OTHER COMBUSTIBLE
GASES.
Most combustible gas detection systems are concerned with %LEL (Lower Explosive Limit). 100 % LEL
of Methane (Natural Gas) is 5% by volume in air. If the gas shipped to you is not labelled in %LEL,
divide the concentration by 5 to get % LEL.
e.g. 2.36% vol x 100 = 47.2 %LEL
5
QTS-1710 combustible transmitter/sensor respond to all gaseous hydrocarbons, but to each in different
degree. Methane may be used to calibrate by referring to the table below and applying the formulas given.
For gases not in the list consult factory.
Relative Response to Flammable Gases
Gas
Low r
Explosiv
Limit
LEL
R spons
R lativ to
M than
J
M than
Multipli r
Acetylene 1.5% 0.57 1.75
Benzene 1.2% 0.40 2.46
Cyclohexane 1.3% 0.45 2.22
Ethanol 3.3% 0.45 2.22
Hexane 1.0% 0.45 2.22
Hydrogen 2.2% 0.95 1.05
so-Octane 0.95% 0.35 2.86
so-Propyl Alcohol 2.2% 0.35 2.86
n-Butane 1.8% 0.55 1.82
n-Octane 1.0% 0.55 1.81
Nonane 0.85% 0.25 4.00
n-Propyl Alcohol 2.2% 0.40 2.50
Propane 2.1% 0.60 1.67

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5.1 Conversion Formulae:
C = %LEL of Methane Test Gas
R = Equivalent % LEL of Target Gas
S = Signal in milliamps
J = number from the table above
JCR *
=
S = 4 + 16 x R mA
100
e.g. Calibration for propane using 2.46 % Methane Test Gas
2.46 % Methane = 49.2 % LEL Methane
R = 1.67 x 49.2 = 82.2 %LEL Propane
S = 4 + 16 x 82.2 = 17.15 mA signal
100
5.2 Calibration Gases
Calibration gas flows of 0.5 litre/minute are acceptable.
Sudden changes in humidity as from dry calibration gases may have a small transient effect on signal,
usually gone within a minute.
Long exhaust hoses (more than six inches or so) may cause back pressure conditions at the sensor and
enhanced signal, especially at high flow rates.
6. Wiring
Wiring is three wires, DC 24 V with one analog signal line.
Figure 4 Wiring Hoop-Up

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7. Remote Sensor Head Mounting
It is often the case that the sensor must be mounted in an inaccessible location. In these cases it is useful to consider
mounting the sensor head remote from the electronics to allow easy access for testing and calibration. This is quite
reasonable and considerable distances are possible if proper installation practices are followed.
7.1 Wiring
The sensor head has a very low resistance, so any interposing wiring will have an effect on accuracy and power. One
should use the maximum wire diameter practical to minimize voltage drops. e.g.
Maximum suggested distances:
• 16 awg 50 feet (15 meters)
• 14 awg 100 feet (30 meters)
• 12 awg 125 feet (35 meters)
It is simply necessary to extend the wire cable length accordingly. Use soldered connections at all wiring joints to
prevent resistance changes with age.
7.2 Calibration
For calibration QEL sells an adapter to connect a 1/4” o.d. tubing to the sensor for remote application of gas. Note
that gas flow should be higher than normal especially if the sensor head is in an area of moving air. Calibration gas
flows of up to 1 liter/minute are standard.

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8. WARRANTY STATEMENT
The information contained in this manual is based upon data considered accurate; however, no warranty is
expressed or implied regarding the accuracy of this data. All QEL equipment is warranted against defects
in material and workmanship for a period of two years from date of shipment with the following
exceptions:
Electrochemical Sensors (Toxic) Six Months
Catalytic Sensors (Combustible) One Year
During the warranty period we will repair or replace, at our discretion, any components or complete units
that prove, in our opinion, to be defective. We are not liable for consequential or incidental damage to
auxiliary interfaced equipment.
A returned material authorization number should be obtained from the factory prior to returning any
goods. All return shipments must be shipped freight prepaid and a copy of the maintenance records
should accompany the unit concerned.
Warranty should be considered F.O.B. the factory. Labour and travel time are chargeable for any field
site visits required for warranty work.
LIMITED LIABILITY
All QEL systems shall be installed by a qualified technician/electrician and maintained in strict
accordance with data provided for individual systems in the form of installation/maintenance manuals.
QEL assumes no responsibility for improper installation, maintenance, etc., and stresses the importance of
reading all manuals. QEL shall not be responsible for any liability arising from auxiliary interfaced
equipment nor any damage resulting from the installation or operation of this equipment.
QEL’s total liability is contained as above with no other liability expressed or implied as the purchaser is
entirely responsible for installation and maintenance of systems.
This warranty is in lieu of all other warranties, expressed or implied, and no representative or person is
authorized to represent or assume for QEL any liability in connection with the sales of our products other
than that set forth herein.
NOTE: Due to on-going product development, QEL reserves the right to change specifications
without notice and will assume no responsibility for any costs as a result of
modifications.
For further information or assistance, contact:
QUATROSENSE ENVIRONMENTAL LTD.
5935 Ottawa Street, PO Box 749
Richmond, Ontario
K0A 2 0
Tel: [phone]
Fax: [phone]
Email: [e-mail]
Web: www.QELsafety.com