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 Instruction Manual

Model 4105 Gas Sensor Module (12/02)

Page:  7

6.4a. Combustibles

1.  Verify the voltage across A to R equals 2 volt.  If

not, adjust volts potentiometer R11

2.  Verify the voltage from GND (TB2) to VOUT

equals 0.4 volts.  If not adjust BAL potentiom-
eter (R2)

3.  Verify that the voltage at VOUT is equal to the

voltage desired.

The VOUT test point on the I/O PCB has a range
of 0.4-2 volts for 0-100% of the measurement
range.  Therefore, 0%=0.4 volts, 25%=0.8,
50%=1.2 volts, 75%=1.6 volts, 100%=2 volts.

Selecting the jumper at JP1 assigns one of four
different sensitivity ranges to the module.  The
JP1 positions are labeled 1, 2, 3 & 4.  JP1 jumper
set the coarse up scale SPAN values by affect-
ing the gain of the analog circuit.  JP1 is set
correctly if an application of 50% of full scale
reads between 1.0 & 1.4 volts on VOUT.  Fine-
tuning of these setting is done later by adjust-
ing the 4105-02 magnetic control.

JP1 gain values are as follows:

JP1 with jumper in position 1 = GAIN = 51
JP1 with jumper in position 2 = GAIN = 26
JP1 with jumper in position 3 = GAIN = 12.5
JP1 with jumper in position 4 = GAIN = 7
JP1 with no jumper = GAIN = 1

More than one jumper may be installed to allow
additional gain value.  Multiple jumper are addi-
tive in relation of the gain value.  For example, if
a gain of 20 is needed, jumper should be placed
in positions 3 and 4 to provide a gain of 20.

6.4b LEL Sensor Fault Supervision

The typical failure mode of catalytic bead sensors
is the reference or active beads open circuit. In
rare cases a short circuit may develop. The 4105-
02 is equipped with fault detection circuitry that
detects either condition. A FAULT is also signaled
if the output drifts below -10% of full scale. The
4105-02 signals a FAULT condition exists by over-
writing the LCD with a FLt message, flashing the
red LED on the front panel and clamping the 4-
20mA output at 0mA. These conditions remain until
the FAULT is corrected.

6.4c Electrochemical (Oxygen and Toxics)

Verify that the voltage VOUT is equal to the volt-
age as desired.

The VOUT test point on the I/O PCB has a range

of 0.4-2 volts for 0-100% of the measurement
range.

The 4105-XX has 4 fixed ranges of sensitivity,

which are selectable via JP1.

The JP1 positions are labeled 1, 2, 3 & 4.

JP1 jumper set the coarse up scale SPAN values

by affecting the gain of the analog circuit.

JP1 is set correctly if a 50% of full-scale gas

read between 1.0 & 1.4 volts on VOUT.

Fine-tuning of these settings is done later by

adjusting the 4105-XX via magnetic control.

Select the jumper at JP1 as required.  JP1 gain

values are as follows:

JP1 with jumper in position 1 = GAIN = 5.5
JP1 with jumper in position 2 = GAIN = 4
JP1 with jumper in position 3 = GAIN = 2.3
JP1 with jumper in position 4 = GAIN = 1.5
JP1 with no jumper = GAIN = 1

More than one jumper may be installed to allow

additional gain value.  Multiple jumper are addi-
tive in relation of the gain value.  For example, if
a gain of 6.5 is needed, jumper should be placed
in positions 2 and 3 to provide a gain of 6.3.

Note: Allow the new sensor to stabilize for a mini-
mum of 30 minutes and then calibrate using the
procedure in Section 5.

6.4d Missing Electromechanical Sensor Fault Supervision

Many electromechanical sensor housings allow for
easy replacement of defective sensors by making the
sensors 'plug in'.  A problem is that if the sensor is
removed, many transmitters continure to display the
safe reading of 0 PPM. The 4105-XX is equipped with
fault detection circuitry that detects a missing sensor.
Within several minutes of removing an EC sensor, the
4105-XX will signal a FAULT condition. A FAULT is
also detected if the sensor output drifts below -10%
of full scale. the Model 4105-XX demonstrates a
FAULT condition exists by overwriting the LCD read-
ing with FLt, illuminating the red LED on the front
panel and by clamping the 4-20mA output at 0mA.
These conditions exist until the FAULT is corrected.

Summary of Contents for 4105 SERIES Applicability & effectivity

Page 1: ...MODEL 4105 SERIES GAS SENSOR MODULE WITH DIGITAL DISPLAYAND NON INTRUSIVE CALIBRATION 4 20 mA...

Page 2: ...n 4105 05 Hydrogen Sulfide Gas Sensor Module with Non Intrusive Calibration 4105 06 Chlorine Gas Sensor Module with Non Intrusive Calibration 4105 07 Hydrogen Gas Sensor Module with Non Intrusive Cali...

Page 3: ...Transmitter Installation 3 3 6 Start up Operation 3 4 OPERATION 4 4 1 Introduction 4 4 2 Signal Value 4 5 CALIBRATION 5 5 1 Frequency of Calibration 5 5 2 Calibration Process 5 5 3 Equipment Required...

Page 4: ...which contains the transmitter electronics and a gas sensor which is installed in one of the two 3 4 conduit hubs 1 3 1 Electronics When installed the transmitter electronics will be con nected to a p...

Page 5: ...soldered Improperly spliced cable can result in corrosion resistance changes and system errors Wire Gauge Maximum Length 20AWG 2 000 Ft 18AWG 3 000 Ft 16AWG 4 000 Ft 14AWG 6 500 Ft 12AWG 9 000 Ft Tab...

Page 6: ...e moval and replacement of the sensor assembly which is threaded into the second 3 4 conduit hub 3 4 Wiring Connection To gain access to the I O PCB for wiring or mounting purposes loosen the two capt...

Page 7: ...r failure occurs Periodic cleaning as necessary Unanticipated maintenance 4 2 Signal Value During normal operation the current loop of the sen sor module and the controller will be between 4 mA indica...

Page 8: ...tic tool provided with each sensor Briefly hold the magnet tool close to the small dot located on the lower edge of the front panel The arrow on the upper left side of the LED will illuminate and the...

Page 9: ...new transmitter 7 Restore power and allow a minimum of 30 minutes for stabilization before re calibration 6 4 Sensor Replacement The sensor should be replaced when it is determined that It is no long...

Page 10: ...output at 0mA These conditions remain until the FAULT is corrected 6 4c Electrochemical Oxygen and Toxics Verify that the voltage VOUT is equal to the volt age as desired The VOUT test point on the I...

Page 11: ...facing vertically down The lid of the sensor module should face out for easy access Sensors may be mounted directly onto the end of a vertical conduit or bracketed to a vertical surface us ing the tw...

Page 12: ...VOLTS BAL R 2 R11 U1 Sensor Pwr Sig Black Brown Red Toxics P1 TB1 TB2 RIBBON CABLE TO CPU ASSY VOUT JP2 B A JP1 1 3 2 4 U2 U7 U4 U5 U1 S C R R19 ST 46A EC I O PCB FOR ELECTROCHEMICAL SENSORS Sensor Pw...

Page 13: ...F 14 to 122o F 14 to 122o F 14 to 122o F 14 to 122o F 10 to 75o C 7 to 50o C 10 to 50o C 10 to 50o C 10 to 50o C 10 to 50o C 10 to 50o C Relative Humidity 10 95 5 99 15 90 15 90 15 90 10 90 15 90 Pre...

Page 14: ...0 to 50o C 10 to 50o C 10 to 50o C 10 to 45o C 10 to 45o C Relative Humidity 15 90 15 90 15 90 20 90 20 90 Pressure 10 10 10 10 10 Electrical Data Input Voltage DC 19 30 VDC at less than 100 mA Output...

Page 15: ...0 55 30 2 40 50 4105 05 H2 S 0 5 100 20 0 1 15 15 0 0 0 0 4105 06 Cl2 0 10 100 0 0 105 0 0 0 0 4105 07 H2 1 20 0 100 3 0 35 3 35 85 4105 10 SO2 1 0 40 0 100 100 0 0 15 0 4105 12 NO2 0 20 90 0 0 100 0...

Page 16: ...ited to the cost of the equipment The purchaser must obtain shipping instructions for the prepaid return of any item under this warranty provision and compli ance with such instruction shall be a cond...

Page 17: ...e end of its adjustment range Appendix B L C D Readout Calibration Procedure The 3 1 2 digit LCD meter span and decimal points may be configured for full scale ranges such as 1 100 0 25 0 10 0 0 1000...

Page 18: ...ion of calibration gas must be less than the factor number listed on Table 1 The formula for calibration is as follows Display Cal gas Factor where Display the span gas applied Cal gas is the percent...

Page 19: ...methylformamide 46 83 Ethyl Formate 44 80 Ethylmercaptan 56 102 n Heptane 39 70 n Hexane 37 67 Hydrazine 45 82 Hydrogencyanide 48 86 Hydrogen 77 139 Hydrogen Sulfide 41 74 Methane 100 181 Methyl Actet...

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