Interscan Corporation GF1900 User manual

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GF 1900
SULFURYL
FLUORIDE
ANALYZER

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REVISIONS
REVISION
NUMBER
REVISION
DATE
BRIEF DESCRIPTION
A 08/04/06 Manual format written for new standard. Included
modified warnings and warranty.
A-1 08/17/06 Modification of intro.page - JS
B 11/19/07 emoval of reference to Dow Agro or Vikane
C 04/07/11 Update references for setup to 5 ppm calibration.

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TABLE OF CONTENTS
INT ODUCTION…………………………………………………….5
CAUTIONS……………………………………………………………8
OPE ATION………………………………………………………….9
CALIB ATION………………………………………………………10
MAINTENANCE…………………………………………………….11
T OUBLE SHOOTING……………………………………………..12
ACCESSO IES………………………………………………………14
WA ANTY…………………………………………………………16
DIAG AMS, SCHEMATICS, AND PA TS............................................17
MAIN CI CUIT BOA D……………………………………18
WI ING DIAG AM………………………………………....19
PA TS LIST………………………………………………….20
BATTE Y PACK WI ING………………………………….22
ETU N AUTHO IZATION………………………………………23

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INTRODUCTION
The Interscan GF1900 Sulfuryl Fluoride gas fumigant analyzer is
expressly designed for use as a clearance monitoring device to determine
safe re-occupation of a structure after aeration only Use of this device
for any purposes other than use as a clearance device will invalidate the
warranty
The furnace is a key and essential component of the GF1900. Due to extreme heat (900
degrees C) the furnace has a limited life. Mean Time Before Failure (MTBF) is one
thousand (1000) hours. This is the average lifetime of accumulated runtime hours before the
furnace will fail due to the extreme operating heat.
Note: The furnace life is further dependent on the exposure duration and level of the
the Sulfuryl Fluoride (SO
2
F
2
) gas.
Exposure to levels in excess of 0 ppm of Sulfuryl Fluoride (SO
2
F
2
) gas can
lead to greatly reduced life or instantaneous failure of the furnace.
The Sulfuryl Fluoride (SO
2
F
2
) gas is passed to the Interscan Sulfur Dioxide sensor
for conversion to an electrical current in direct proportion to the gas level. This signal is
then processed by the circuitry for display on the meter in engineering units of parts per
million (ppm).

SULFURYL FLUORIDE MANUAL REV C PAGE 6 OF 23 04/07/11
1] eady L.E.D. - illuminates when furnace reaches proper preset operating temperature.
NOTE: The “ eady” L.E.D. is not an indicator of Sensor stabilization.
2] LO BAT. – illuminates when battery pack or AC power supply is at or below 19.0 V DC.
3] Meter – Analog display of engineering units, parts per million (ppm).
4] Zero – sets the zero on the meter at beginning of analysis to compensate for sensor
background current.
5] CAL. - Sets meter to read correct engineering units when exposed to calibration gas of
certified value.
6] ON L.E.D. – illuminates when power is turned on by function switch.
7] FUNCTION SWITCH – selects operation and meter display:
ON – analyzer is powered and meter displays engineering units,
BAT TEST - analyzer is powered and meter displays battery pack level.
Note: Meter level must be at or above LO BAT mark for proper fuction.
8] POWE CONNECTO – input connector for Battery Pack or AC power supply.

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Gas sample inlet PO T. Tubing is pushed into port until seated and then gently pulling
back. The pulling back action is performed to properly seal the connection. Teflon
tubing ¼ O.D. x 1/8 I.D. is recommended for use. Length should not exceed twelve
(12) inches when used with factory calibration. Lengths of twelve (12) to forty eight (48)
inches can be used only if calibrated with chosen length attached during process.
NOTE: Longer lengths than twelve (12) inches can increase response time.

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CAUTIONS
1] Items inside yellow boundary can cause injury. Do not attempt to service
until instrument has cooled for one (1) hour.
2] DO NOT attempt to use in areas where gasoline, sulfur compounds, or
highly flammable vapors are present. The presence of any of these could produce an
EXPLOSION.
3] Areas which operate mobile phones, CB's, etc., may cause electronic interference. This is
evidenced by random or erratic meter deflection.

SULFURYL FLUORIDE MANUAL REV C PAGE 9 OF 23 04/07/11
OPERATION
1) Turn the FUNCTION SWITCH knob to the OFF position and connect an AC
power supply or battery pack. Tighten the connector completely.
NOTE: Turn only the knurled ring to tighten. Tightening the connection
by turning any other portion of cable can result in a short, fire, or explosion.
2) Turn the FUNCTION SWITCH to ON or BAT TEST and wait for the READY
indicator to light.
3) After the EADY light is ON, set the meter to ZE O with the ZERO knob.
NOTE: New or replacement sensors may require approximately 24 hours to stabilize prior to
zeroing. For best results (to prevent zero dri t) the first time the monitor is used during the
day, set the meter to 20 a ter the READY light is ON. I the meter is moving up or down,
wait until it stops. Then adjust the meter to ZERO. An alternative is to turn the unit ON in
the shop, irst thing in the morning or 20 or 30 minutes. In this case, no meter adjustment is
necessary.
4) The unit is now ready to use.
5) When using the battery pack, the LO BAT indicator will light when there is
approximately 10 minutes operating time left. After the light is ON, turn the control
knob to BAT TEST to see if the meter is ON, or to the left of the BAT line. If the
meter is to the right of the line, turn back to ON for continued gas readings. Check the
battery condition every few minutes. When the meter shows LO BAT, turn the control
knob to OFF.
6) echarge batteries overnight. Approximately eight (8) to ten (10) hours.
7) Approximately 70 minutes operating time is available with a fully-charged battery pack.
NOTE: Disregard a LO BAT indication when using an AC power source.

SULFURYL FLUORIDE MANUAL REV C PAGE 10 OF 23 04/07/11
CALIBRATION
Note: Should be done every 3 months or more frequent. Some companies require
monthly calibration.
The instrument is calibrated by introducing, a known concentration of Sulfuryl
Fluoride gas (5 ppm), and adjusting the SPAN control to correspond to the known
analysis of the gas.
NOTE: New or replacement sensors may require approximately 24 hours to stabilize prior to
zeroing.
With the unit turned on and sufficiently warmed up with the READY light
illuminated, zero the analyzer with the ZERO control. Fill a sample bag with Sulfuryl
Fluoride standard, and connect it to the inlet, allowing the gas to flow for at least 3
minutes. DO NOT ATTEMPT TO INTRODUCE THE VIKANE
STANDARD DIRECTLY FROM A PRESSURIZED SOURCE. A
SAMPLE BAG MUST BE USED.
Do not introduce concentrations higher than 0 ppm.
The CAL control is used to set the meter to a value corresponding to the span
gas concentration. Disconnect the sample bag. Allow to stabilize for 3 minutes.
epeat procedure two additional times.
The readings should be within ± 2 divisions of the average of your three readings.

SULFURYL FLUORIDE MANUAL REV C PAGE 11 OF 23 04/07/11
MAINTENANCE
Furnace Replacement .
Make sure power is disconnected and the analyzer is allowed to cool.
Do not attempt to service until cooled for a minimum of one (1) hour.
emove the thermocouple leads at terminals 3 and 6 of the terminal block. For
easy access, loosen the sensor clamp screw and lift the sensor out, placing it on the
fan. It should not be necessary to remove any tubing.
Minimize twisting by griping supports before loosening the coupling nuts. Before
installing the replacement furnace, loosen the screws on the slotted support bracket.
Drill and tap two new 6-32 holes ¼ inch from old toward door side if only two holes
are present in the clear block. This allows for newer furnaces which may be longer or
shorter than original equipment. First test fit new furnace. Move slotted
mounting bracket screws to a position that does not distort the furnace
fittings. Failure to check this may damage furnace. Do not twist furnace
fittings as they are a press fit and can be damaged.
Position the furnace and hand-tighten the coupling nuts. Secure the bracket and
snugly tighten the coupling nuts while maintaining the position of the fitting with a
second wrench. Note: Excessive force will result in furnace damage. Connect
thermocouple wires and replace the sensor. Close the top to position the insulator so
it does not lie against the furnace.

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TROUBLE SHOOTING
READY light does not illuminate.
Check that the POWE L.E.D. is illuminated. If it is not:
1) Check the main fuse.
2) Check that the rear connector is tight.
3) Check the power source for a nominal 24V.
4) Check that the circuit board connector is tight.
If POWE L.E.D. is illuminated:
1) Carefully check if the furnace is cold.
2) If furnace is cold, check for an open 4A fuse.
3) If fuse is good, disconnect the power source
and connect an ohmmeter across the furnace
support brackets. The reading should be less
than 5 ohms.
If the furnace is good, re-connect the power source and turn the analyzer on.
With a DVM, check the voltage at the Q4 regulator output. It should read
16.45V or greater to allow proper warm up time of 6 to 9 minutes. Adjustments
are performed by turning the potentiometer screw of 12.
If regulator output is normal, check for the same voltage at Q5 base and for 24V
at the collector. Normal readings here indicate a failed Q5, or discontinuity
between the furnace and emitter, or furnace and ground.
To check Q4:
1) If Q4 output is close to zero and feels hot, C7
may be shorted.
2) If Q4 is cool, check for 24V at the input.
3) Check the voltage at the " " terminal. If it
is 1V or less and the output is around 2V, Q1
has failed or is being activated.

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Furnace is hot, EADY light is not on.
Thermocouple may be defective. Check across leads for mV reading. The
reading should be greater than 20 mV after 5 minutes. everse thermocouple
leads if the reading is negative.
If thermocouple is okay, 27 may be set incorrectly. With the thermocouple
reading approximately 35 mV, adjust 27 to get a EADY indication.
No response to Vikane. Furnace hot.
Make sure that the hole in the Sensor inlet fitting is not blocked.
Check that banana plug is connected to the sensor and the clamp is tight.
Check for 550 mV (± 15 mV) on sensor clamp or blue wire to the sensor.
Check that the meter responds to ZE O control.
Connect a rotameter to the inlet and open the valve completely. Check for
approximately 50-100 cc/min flow.
Meter off scale. No response to ZERO control.
Disconnect sensor banana plug and check for ZE O control.
Check output of Q2 for 4.5 to 5.5V.
Check output of U3 for a negative reading 93% or greater of the value at Q2.
Sensor clamp or voltage at blue wire to sensor not at 550 mV (± 15 mV).
Check reference voltage at C 1. This should read between 1.21 and 1.23 V.

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ACCESSORIES
Figure 1: GFPS1297 AC POWER SUPPLY
Figure 2: VKBP 24 VDC BATTERY PACK

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Figure 3: BC1-24V PATTERY PACK CHARGER

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WARRANTY
INTERSCAN CORPORATION warrants the GF1900 gas fumigant analyzer of
its manufacture (furnaces, sensors, batteries, fuses lamps, tubing, fittings,
filters and scrubbers EXCEPTED) to be free from defects in material and
workmanship for a period of one year from date of shipment.
INTERSCAN CORPORATION warrants furnaces for six (6) months from date
of shipment to be free from defects in material and workmanship. No
warranty is expressed or implied as to the functional life of the furnace.
INTERSCAN CORPORATION warrants sensors of its manufacture to be free
from defects in material and workmanship for a period of six (6) months from
date of shipment.
INTERSCAN CORPORATION's sole obligation under this warranty is
limited to repairing or replacing, at its option, any item
covered under this warranty, when such item is returned intact,
prepaid to the factory (or designated service center).
This warranty does not apply to any of our products which have
been repaired or altered by unauthorized persons, or which have
been subject to misuse, negligence, or accident, incorrect wiring
by others, installation or use not in accordance with
instructions furnished by the manufacturer, or which have had the
serial numbers altered, effaced, or removed. The sensors are
factory sealed and must not be opened or modified in the field
for the warranty to remain in effect. This warranty is in lieu
of all other warranties, whether expressed or implied.
Additionally, in a custom system, warranty on any component shall
not exceed the manufacturer's warranty given to INTE SCAN
CO PO ATION.

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DIAGRAMS, SCHEMATICS & PARTS

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Parts List…Interscan Model GF1900
RESISTORS
R1 6192F R14 2430F
R2 4992F R1 1001F
R3 49R9F R16 20KΩ
ΩΩ
Ω
R4 2492F R17 1Ω
ΩΩ
Ω
R 4992F R18 1003F
R6 2492F R19 .1KΩ
ΩΩ
Ω
R7 27KΩ
ΩΩ
Ω R20 1.2KΩ
ΩΩ
Ω
R8 1001F R21 1273F
R9 2 2F R22 10MΩ
ΩΩ
Ω
R10 47Ω
ΩΩ
Ω, 1W R23 7 01F
R11 6Ω
ΩΩ
Ω R24 100Ω
ΩΩ
Ω
R12 4021F R2 1.2KΩ
ΩΩ
Ω
R13 100KΩ
ΩΩ
Ω R26 4991F
RESISTORS, VARIABLE
R12 0kΩ
ΩΩ
Ω, 3262X-1- 03/BOURNS
R27 20KΩ
ΩΩ
Ω, 3262X-1-203/BOURNS
R28 10KΩ
ΩΩ
Ω, 32 0w-1-103/BOURNS
R29 ` 0KΩ
ΩΩ
Ω, 3 90S-2- 03/BOURNS
CAPACITORS
C1 47µ
µµ
µF, TANTALUM, 6VDC
C2, C3, C6 10µ
µµ
µF, TANTALUM, 2 VDC
C4 6.8µ
µµ
µF, TANATALUM
C8 _________________________
C 1000µ
µµ
µF, ELECTROLYTIC