Interscan Corporation GF1900 User manual

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Sulfuryl Fluoride Monitor –GF1900
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GF1900
SULFURYL
FLUORIDE
MONITOR

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TABLE OF CONTENTS
INTRODUCTION…………………………………………….............……..... 4
SYMBOL KEY ………………………………………………………………… 4
PICTURE OF GF1900 ………………………………………………………. 5
CASE LAYOUT…………………………………………………………..... 6-7
CAUTIONS…………………………………………………................…….… 8
OPERATION……………………………………………..............…..…….…. 9
CALIBRATION………………………………………………………............. 10
MAINTENANCE………………………………………………............….….. 11
TROUBLE SHOOTING………………………………………….......…. 12-13
ACCESSORIES…………………………………………………............. 14-15
WARRANTY…………………………………………………..…..............…. 16
DIAGRAMS, SCHEMATICS, AND PARTS......................................... 17-19
SCHEMATIC.........................…………...............................17
WIRING DIAGRAM ………………………................…….... 18
BATTERY PACK WIRING………….…..............….….……. 19
CONSUMABLE PARTS...................................................... 19
RETURN AUTHORIZATION………………………………..………............ 20

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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 reoccupation of a
structure after aeration only. Use of this device for any purposes other than use as a
clearance device will invalidate the warranty, and is not in accordance with
manufacturer’s suggested use or the intended use of the device.
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 (SO2F2) gas.
Exposure to levels in excess of 50 ppm of Sulfuryl Fluoride (SO2F2) gas can
lead to greatly reduced life or instantaneous failure of the furnace.
The Sulfuryl Fluoride (SO2F2) 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).
SYMBOL KEY
- GENERAL CAUTION
- Warning
- Heat
- explosion

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Figure 1
GF1900 instrument in blue carrying case (figure 1)

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Figure 2
1) READY L.E.D. - Illuminates when furnace
reaches proper preset operating Temperature.
Note: The "Ready" L.E.D. is not an indicator of
Sensor Stabilization.
2) LO BAT. - illuminates when the Battery Pack or
AC power supply is at 19.0 VDC.
3) Meter - Analog display.
4) Meter Dial - linear indication of the Engineering
units in Parts Per Million (PPM).
5) Carrying Handle
6) CAL. - Potentiometer set screw to adjust meter to
display correct PPM level when exposed to
calibration gas of a certified value.
7) Furnace Off - Lifting cover and flipping switch up
turns furnace off during prolonged periods of
stabilization. This helps to prolong furnace life.
Normal use is with cover down.
8) ON L.E.D. - illuminates when power is turned on
at Function Switch.
9) Zero - sets the Analog Meter to read zero at
beginning of monitoring to compensate for sensor
background current.
Figure 2
10) Function Switch - Selects operation and meter display:
ON - monitor is powered and the meter displays ppm level,
BAT TEST - analyzer is powered and meter displays battery pack level.
Note: Meter level must be at or above LO BAT mark for proper operation.
11) Power Connector –input connector for Battery Pack or AC Power Supply.

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figure 3
Gas sample inlet PORT (figure 3). 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 or 0.63500cm OD x 0.31750 cm ID. is
recommended for use. Length should not exceed twelve (12) inches (30.480 cm) when
used with factory calibration. Lengths of twelve (12) inches (30.480 cm) to forty eight
(48) inches (121.92 cm) can be used only if calibrated with chosen length attached
during process.
NOTE: Longer lengths than twelve (12) inches (30.480 cm) can increase response
time.

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CAUTIONS
Figure 4
1) Items inside yellow boundary can cause injury. Do not attempt to service
until instrument has cooled for one (1) hour. (Figure 4)
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.

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OPERATION
1) Turn the FUNCTION SWITCH knob to the OFF position and connect the AC power
supply (PN# 040-00079) (110VAC) or (PN# 040-00080) (220VAC) or battery
pack (BP24V) . 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 and wait for the READY indicator to light.
3) After the READY is illumined, check that the meter is stable (needle is steady and not
moving) before attempting to zero the instrument. Depending on when the instrument
was last used, this may take a few extra minutes. Then set the meter to ZERO with the
ZERO knob.
NOTE: New or replacement sensors may require approximately 24 hours to
stabilize prior to zeroing. During this period you can lift the Furnace Off cover to
up position and lift the switch up toward (figure 5) the Meter to prevent the
furnace from running. This action helps to extend furnace life. Return the
Furnace off cover to the down position when the monitor is stable. For best
results (to prevent zero drift) the first time the monitor is used during the day, set
the meter to 20 after the READY light is ON. If the meter is moving up or down,
wait until it stops. Then adjust the meter to ZERO.
Furnace Switch Furnace Switch Furnace Switch
Open/off Open/on Closed/on
Figure 5
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) Recharge batteries overnight. Approximately nine (9) to ten (10) hours.
7) Approximately 70 minutes operating time is available with a fully charged battery

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pack.
NOTE: Disregard a LO BAT indication when using an AC power source.
CALIBRATION
Note: Should be performed every 3 months or more frequent.
The Sulfuyl Fluoride monitor’s sensor must be stable for readings to be correct.
Prolonged non-use caused the sensor to be unstable because it must be exposed to the
Bias voltage periodically. If the analyzer has not been used in a duration of two weeks,
or longer, you must power “ON” the monitor and allow it to stabilize. Depending on the
model revision of your analyzer, you can lift one side of the furnace fuse, or on newer
Monitors turn off the RED Furnace switch (up position) to prolong the life of the furnace
during stabilization.
In general, the monitor will indicate an upscale reading when powered on and drift
downward while the monitor warms up. Upscale readings can exceed the full scale
and does not necessarily mean there is a malfunction. The upscale reading must
be stable within the warm-up period. Continued drifting after the ready light comes
on will create an erroneous zeroing of the analyzer. (A true zero cannot be achieved).
Additional run time may be required if this condition exists. You may only perform
clearance or calibration once the monitor is stable and zeroed.
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 SO2F2STANDARD DIRECTLY FROM A
PRESSURIZED SOURCE. A SAMPLE BAG MUST BE USED. Do not introduce
concentrations higher than 50 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. Repeat
procedure two additional times. Do not rezero the instrument, it is not necessary to wait
for the meter to reach zero, before connecting the sample gas for the second and third
time. The readings should be within ± 2 divisions of the average of your three readings.
Best Calibration is achieved by using as few sample bags as possible. A five liter
sample bag or larger is recommended. This will generally cover the three samples.
Readings can sometime jump when the sample bag is disconnected and then drop
down. This is a normal condition which occurs due to changes in pressure.

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The recovery from a reading is about 120 seconds to 20% of the reading, depending on
the age of the Sensor. Full recovery to zero may occur within 120 seconds, depending
on the age of the Sensor.
NOTE: Zeroing is only performed before the first introduction of the Calibration gas.
Adjustments after subsequent readings will skew the zero causing incorrect readings.
MAINTENANCE
Furnace Replacement
Be 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.
Remove the thermocouple leads at terminals 3 and 6 of the terminal block (figure 6).
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.
Figure 6
Minimize twisting by gripping 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 (0.47625 cm) ¼ inch (0.63500 cm) 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 POWER 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 POWER 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, reconnect the power source and turn the analyzer
on.
With a DVM, check the voltage at the Q4 regulator output. It should read
16.45 VDC or greater to allow proper warm up time of 6 to 9 minutes.
Adjustments are performed by turning the potentiometer screw of R12.
If regulator output is normal, check for the same voltage16.45VDC at Q5
base and for 24V at the collector, if battery power is being used the
voltage can be 19V to 27.6V. 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 "R" terminal. If it is 1V or less and the output is
around 2V, Q1 has failed or is being activated.
Furnace is hot, READY 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. Reverse
thermocouple leads if the reading is negative.

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If thermocouple is okay, R27 may be set incorrectly. With the
thermocouple reading approximately 35 mV, adjust R27 to get a READY
indication.
TROUBLE SHOOTING Con’t.
No response to SO2F2.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 (± 20 mV) on sensor clamp or blue wire to the sensor.
Check that the meter responds to ZERO 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 ZERO 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 (± 20 mV).
Check reference voltage at CR1. This should read between 1.21 and 1.23 V.
Meter drifts when trying to Zero.
Sensor may not be stable due to being powered down for a long period. Leave
FUNCTION SWITCH on, lift “Furnace Off”cover up and flip the switch up toward
Meter. Check the meter for drift and adjust as necessary until stable. Position
“Furnace Off”cover down when stability has been achieved.

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ACCESSORIES
Figure 7
Figure 7: AC Power Supply - P/N 040-00079 (110VAC) , P/N 040-00080 (220VAC)

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ACCESSORIES Con’t.
Figure 8
Figure 8: 24 VDC Battery Pack - P/N BP24V

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Figure 9
Figure 9: Battery Charger - P/N 040-00077
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

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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 INTERSCAN
CORPORATION.

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DIAGRAMS, SCHEMATICS & PARTS

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DIAGRAMS, SCHEMATICS & PARTS, Con’t.
See insert
Of
Wiring Diagram