Cole-Parmer 68935-00, 68935-02, 68935-04, 68935-06, 68935-08 Instruction Manual
...
© 04-08
Cole-Parmer Instrument Co.
625 East Bunker Court
Vernon Hills, Illinois U.S.A. 60061-1844
800-323-4340
fax: 847-247-2929
www.coleparmer.com
e-mail: techinfo@coleparmer.com
Cole-Parmer®Battery-Powered Digital Pressure Gauges
Accuracy
±0.25% of full scale ±1 least significant digit
Includes linearity, hysteresis, repeatability
Display
3 readings per second nominal display update rate
Ranges up to 1999: 31/2 digit LCD, 0.5" digit height
3000 psi, 5000 psi: 4
1
/2 digit LCD, 0.5" digit height,
lower alphanumeric display for engineering units
NEMA 4X models: Red LED backlight on whenever gauge is on
Controls
Ranges up to 1999
Front button turns gauge on/off
Front calibration potentiometers, non-interactive zero and span, ±10% range
3000 psi, 5000 psi ranges
Front button turns gauge on, starts auto shutoff timer, and provides zero function for gauge reference ranges
NEMA 4X models: Button activates backlighting for 1 minute while gauge is on
Internal calibration buttons, non-interactive zero and span, ±10% range
Batteries and Battery Life
Two AA alkaline
5 minute auto shutoff
Low battery symbol on display when batteries must be replaced
Standard models with ranges up to 1999: approx. 2500 hours
Standard models with 3000 psi, 5000 psi ranges: approx. 2000 hours
NEMA 4X models with backlit display and ranges up to 1999: approx. 180 hours
NEMA 4X models with backlit display, 3000 psi, 5000 psi ranges: approx. 150 to
1500 hours depending on backlight usage
Dimensions
Standard: 3.38" W x 2.88" H x 1.65" D housing
NEMA 4X: 3.5" W x 3.0" H x 2.0" D housing
Add approximately 0.75" to height for pressure fitting
Weight
Gauge: 9 ounces (approx)
Shipping weight: 1 pound (approx)
Material and Color
Standard: Extruded aluminum case, epoxy powder coated. Polycarbonate
cover, front and rear gaskets. Light gray body, light gray/blue front.
NEMA 4X: UV stabilized polycarbonate/ABS case, light gray color. Clear polycarbonate window to protect display. Gasketed rear cover, six captive stainless
steel screws.
Pressure/Vacuum Connection and Material
1
/4" NPT male, 316 stainless steel, compatible with most liquids and gases
Overpressure
3000 psig range and metric equivalents: 5000 psig
5000 psig range and metric equivalents: 7500 psig
3000 psi, 5000 psi: 112.5% out-of-range display
ii
– – – or ii–.–.–.–
All others 2 times rated pressure minimum
Burst Pressure
4 times rated pressure minimum or 10,000 psi, whichever is less
Environmental
Storage Temperature –40 to 203°F (–40 to 95°C)
Operating Temperature –4 to 185°F (–20 to 85°C)
Compensated Temperature 32 to 158°F (0 to 70°C)
68935-18
0 to 100.0 psig range
68935-32
0 to 5000 psig range
68936-95 Rubber Boot
Not for NEMA 4X models
Standard
Model no.
NEMA 4X
Model no.
Range Resolution
68935-00 68935-34 760 to 0 torr absolute 1 torr
68935-02 68935-36 0 to 30.0" Hg vacuum 0.1" Hg
68935-04 68935-38 0 to 3.00 psig 0.01 psig
68935-06 68935-40 0 to 5.00 psig 0.01 psig
68935-08 68935-42 –30.0" Hg vac. to 15.0 psig 0.1" Hg/0.1 psig
68935-10 68935-44 –15.0 to 15.0 psig 0.1 psig
68935-12 68935-46 0 to 15.00 psig 0.01 psig
68935-14 68935-48 0 to 30.0 psig 0.1 psig
68935-16 68935-50 –30.0" Hg vac. to 100.0 psig 0.1" Hg/0.1 psig
68935-18 68935-52 0 to 100.0 psig 0.1 psig
68935-20 68935-54 –30.0" Hg vac. to 199.9 psig 0.1" Hg/0.1 psig
68935-22 68935-56 0 to 199.9 psig 0.1 psig
68935-24 68935-58 0 to 300 psig 1 psig
68935-26 68935-60 0 to 500 psig 1 psig
68935-28 68935-62 0 to 1000 psig 1 psig
68935-30 68935-64 0 to 3000 psig 1 psig
68935-32 68935-66 0 to 5000 psig 1 psig
68935-36
0 to 30.0 inHg range, NEMA 4X
68935-66
0 to 5000 psig range, NEMA 4X
Certificate of Conformance
This product is manufactured according to applicable industry standards
and conforms to the manufacturer's engineering, production, calibration,
and quality standards.
This product conforms to the customer’s stated order requirements, including mechanical and electrical specifications, dimensions, physical item
identification (part number and serial number).
This product has been tested and calibrated to meet or exceed accuracy
specifications in effect at the time of manufacture using NIST traceable
standards maintained in accordance with ANSI/NCSL Z540-1 and ISO
10012.
This product is manufactured in the United States of America
Model
Serial Number
Date Purchased
Purchase Order
Cole-Parmer Battery-Powered Digital Pressure Gauges
© 04-08
Installation and Precautions
Install or remove gauge using wrench on hex fitting only. Do not attempt to tighten by turning
housing or any other part of the gauge. Use fittings appropriate for the pressure range of the
gauge. Do not apply vacuum to gauges not designed for vacuum operation. Due to the hardness of 316 stainless steel, it is recommended that a thread sealant be used to ensure leakfree operation. NEVER insert objects into the gauge port or blow out with compressed air.
Permanent damage not covered by warranty will result to the sensor.
Operation – Ranges up to 1999
Press the round button on the front of the gauge to activate the display. The gauge will stay on
for approximately 5 minutes. The gauge can be shut off at any time by pressing the button
again. For models with display backlighting, the backlighting is on whenever the gauge is on.
Turn gauge off when not in use to conserve battery.
Operation – 3000 psi, 5000 psi Ranges
Press and hold the button for approximately 1 second. The full-scale range is indicated, display segments are tested, and the reading and units are displayed. The gauge will stay on for
5 minutes.
Power-Up with Zero (gauge reference models only)
1. Make absolutely certain no pressure is applied to the gauge. The gauge port should be
exposed to normal atmospheric pressure. Note that the zeroing function may only be activated at power-up and the stored zero correction is erased when the gauge is shut off.
2. Press and hold the button.
3. The full-scale range is indicated and the display segments are tested.
4. Continue to press the button until
o o o o
is displayed and then release the button. This indi-
cates that the gauge has been zeroed.
5. The actual pressure is displayed and the 5 minute auto shutoff timer starts.
Attempting to zero the gauge with pressure greater than approximately 3% of full-scale
applied will result in an error condition, and the display will alternately indicate
E r r 0
and the
actual measured pressure. The gauge must be powered down to reset the error condition.
Normal Operation
Following the start-up initialization, the display indicates the pressure reading and the engineering units. The 5 minute auto shutoff timer starts when the gauge is powered up or whenever the button is pushed.
If excessive vacuum is applied, the display will indicate
– E r r
until the vacuum is released.
Applying vacuum to a gauge designed for pressure may damage the sensor. If excessive pressure is applied (112.5% over range), an out-of-range indication of
I – – –
or
I –.–.–.–
will be
displayed depending on model.
Models with Display Backlighting
Display backlighting can be turned on by momentarily pressing the button whenever the gauge
is on. The backlighting will turn on for one minute and then automatically shut off. This also
restarts the auto shutoff timer.
Shut-Down
To shut off the gauge manually at any time, press and hold the button until the display indicates
O F F
(about 5 seconds) and then release.
The display indicates
O F F
five seconds prior to auto shutoff. The button can be pressed to
keep the gauge on. The auto shutoff and backlight timers are reset whenever the button is
pressed and released.
Calibration
All gauges are factory calibrated on NIST traceable calibration equipment. No calibration is
required before placing the gauge into service. Calibration equipment should be at least four
times more accurate than the gauge being calibrated. The calibration system must be able to
generate and measure pressure/vacuum over the full range of the gauge. A vacuum pump able
to produce a vacuum of 10 microns (0.01 torr or 10 millitorr) or lower is required for vacuum
and absolute gauges. It is good practice to install fresh batteries before calibrating batterypowered gauges. Allow the gauge to equalize to normal room temperature before calibration.
Calibration – Ranges up to 1999
Remove the calibration potentiometer covers on the front of the unit to access the zero and
span controls. Zero calibration must be done before span calibration.
Gauge reference Zero: The gauge port must be open to the ambient with no pressure or vacuum applied. Adjust the Zero control until the gauge reads zero with the minus (–) sign occasionally flashing. Gauges may be re-zeroed without affecting the span calibration.
Absolute reference Zero: Apply full vacuum to absolute reference gauges and adjust the Zero
control until the gauge reads zero with the minus (–) sign occasionally flashing. Gauges may
be re-zeroed without affecting the span calibration.
Span calibration: Apply pressure or vacuum depending on the type of gauge. Record readings
at three to five points over the range of gauge and adjust span control to minimize error and
meet specifications. Absolute reference gauges display atmospheric pressure when the gauge
port is open to the ambient and it is normal for the reading to fluctuate in response to normal
atmospheric pressure changes.
Calibration – 3000 psi, 5000 psi Ranges
Remove the screws on the back of the unit and remove cover and note the locations of the two
internal calibration buttons marked UP and DOWN. These buttons are disabled unless the
gauge is in calibration mode.
With the gauge off, press and hold the DOWN calibration button, and also press the front button to power up the gauge in calibration mode. The display first indicates the gauge’s full-scale
pressure range, tests all display segments, and then indicates
CAL
to indicate that the gauge
is in the calibration mode. Release all buttons.
The display will then indicate the current pressure reading. The gauge will remain in the calibration mode until powered down. While in the calibration mode the shutoff time, is disabled
and the calibration buttons are active.
Each press of the UP or DOWN button
makes a small correction, which may
not always be indicated on the digital
display. Press and hold the push button
for one second or longer to make larger
continuous corrections. The display of
the gauge being calibrated is adjusted to
match the calibrator’s setting or readout.
If the battery pack is unplugged during
calibration, calibration settings will not
be saved.
1. With the gauge port open to atmosphere, the character display will alternate between
ZERO
and
CAL
. Press the
UP and DOWN buttons to obtain a display
indication of zero.
2. Apply full-scale pressure. The character display will alternate between
+SPAN
and
CAL
.
Press the UP and DOWN buttons to obtain a display indication equal to full-scale pressure.
3. Apply 50% of full-scale pressure. The character display will alternate between
+MID
and
CAL
. Press the UP and DOWN buttons to obtain a display indication equal to 50% of full-scale
pressure.
4. Exit the calibration mode and save the calibration data by pressing and holding the front button until the display indicates
OFF
.
5. Verify pressure indications at 0%, 25%, 50%, 75%, and 100% of full scale.
6. Replace the rear cover and screws, taking care not to pinch the power leads between the
case and the rear cover.
Battery Replacement
A low battery indication will be shown in the upper left-hand corner of the display when the
battery voltage falls sufficiently. The battery should be replaced soon after the indicator comes
on or unreliable readings may result.
Remove the 6 Phillips head screws on the back of the unit.
Carefully remove batteries from the holders by lifting up the positive end of the battery (opposite the spring). Take care not to bend or distort the battery retention springs.
DO NOT discard the old battery into fire, any other sources of extreme heat, or in any other hazardous manner. Please consult local authorities if there is any question about proper disposal.
Always replace both batteries at the same time with high quality alkaline batteries. Observe
the polarity of the batteries when replacing them. The negative (flat) end of each battery should
be inserted first, and should face the spring in the battery holder.
Replace the back cover, including the rubber sealing gasket.
Dimensions
3000 psi and 5000 psi models use internal zero and span adjustments and do not have potentiometers.
1
/4 NPT
Cole-Parmer Instrument Co. / Made in USA
2.88"
3.38
"
0.75"
1.65
"
PSIG
Tur n
at hex
fitting
only
Span
Zero
31/2 digit or
4 digit display
1
/4 NPT
Cole-Parmer Instrument Co. / Made in USA
3.0"
3.5
"
0.75"
2.0
"
PSIG
Span
Zero
31/2 digit or
4 digit display
Tur n at
hex
fitting
only!
DOWN UP
NEMA 4X
Standard
Cole-Parmer®Battery-Powered Gauges with Min/Max/Zero
68936-32
0 to 5000 psig range
Accuracy
Standard: ±0.25% of full scale ±1 least significant digit
Includes linearity, hysteresis, repeatability
Display
3 readings per second nominal display update rate
4 digit LCD, 0.5" H, 5 character 0.25" H alphanumeric lower display
Controls & Functions
Front button turns gauge on or off and cycles through functions
Calibration
Internal calibration buttons
Non-interactive zero, span, and linearity, ±10% range
Auto Shutoff
5 minutes
Batteries, Battery Life, Low Battery Indication
2 AA alkaline
Battery life approximately 2000 hours
Low battery symbol on display when batteries must be replaced
Dimensions
3.38" W x 2.88" H x 1.65" D housing
Add approximately 0.75" to height for pressure fitting
Weight
Gauge: 9 ounces (approx)
Shipping weight: 1 pound (approx)
Material & Color
Extruded aluminum case, light gray epoxy powder coated, ABS/ polycarbonate
bezel, front and rear gaskets, polycarbonate label
Pressure/Vacuum Connection Size & Material
1/4" NPT male
All wetted parts are 316 SS, compatible with most liquids and gases
Overpressure
3000 psig range and metric equivalents: 5000 psig
5000 psig range and metric equivalents: 7500 psig
All others: 2 x sensor pressure
112.5% out-of-range display: I – – – or I –.–.–.– depending on model
Burst Pressure
4 times sensor pressure rating, or 10,000 psi, whichever is less
Environmental
Storage Temperature –40 to 203°F (–40 to 95°C)
Operating Temperature –4 to 185°F (–20 to 85°C)
Compensated Temperature 32 to 158°F (0 to 70°C)
Model no. Range Resolution
68936-00 760.0 to 0 torr absolute 0.1 torr
68936-02 0 to 30.00" Hg vacuum 0.01" Hg
68936-04 0 to 3.000 psig 0.001 psig
68936-06 0 to 5.000 psig 0.001 psig
68936-08 –30.0" Hg vac. to 15.0 psig 0.1" Hg/0.1 psig
68936-10 –15.00 to 15.00 psig 0.01 psig
68936-12 0 to 15.00 psig 0.01 psig
68936-14 0 to 30.00 psig 0.01 psig
68936-16 –30.0" Hg vac. to 100.0 psig 0.1" Hg/0.1 psig
68936-18 0 to 100.0 psig 0.1 psig
68936-20 –30.0" Hg vac. to 200.0 psig 0.1" Hg/0.1 psig
68936-22 0 to 200.0 psig 0.1 psig
68936-24 0 to 300.0 psig 0.1 psig
68936-26 0 to 500.0 psig 0.1 psig
68936-28 0 to 1000 psig 1 psig
68936-30 0 to 3000 psig 1 psig
68936-32 0 to 5000 psig 1 psig
Function
Button Prompt
(Release Button)
Result
On Press 1 sec Gauge Range/Display Test Actual Pressure
One Touch Zero Press/hold
oooo
Zeroed Actual Pressure
Hi Reading Press/hold
HHII HHII
& max. reading
Lo Reading Press/hold
LLoo LLoo
& min. reading
Exit Hi/Lo Press/hold
AAPP
Actual Pressure
Clear Hi/Lo Press/hold
HHII/ LLOO/ AAPP ☞☞CCii
r
Actual Pressure
Clear Zero, Off Press/hold
HHII/ LLOO/ AAPP ☞☞CCiir☞☞ OOFFFF
Clear Zero, Gauge Off
© 04-08
Cole-Parmer Instrument Co.
625 East Bunker Court
Vernon Hills, Illinois U.S.A. 60061-1844
800-323-4340
fax: 847-247-2929
www.coleparmer.com
e-mail: techinfo@coleparmer.com
68936-95 Rubber Boot
Certificate of Conformance
This product is manufactured according to applicable industry standards
and conforms to the manufacturer's engineering, production, calibration,
and quality standards.
This product conforms to the customer’s stated order requirements, including mechanical and electrical specifications, dimensions, physical item
identification (part number and serial number).
This product has been tested and calibrated to meet or exceed accuracy
specifications in effect at the time of manufacture using NIST traceable
standards maintained in accordance with ANSI/NCSL Z540-1 and ISO
10012.
This product is manufactured in the United States of America
Model
Serial Number
Date Purchased
Purchase Order
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