Psitronix calibration

[jbscuba]

Hi everyone,
I have a digital Psitronix 5000G digital pressure gauge. I use it for partial pressure tank filling. The problem is the settings are off by -35 to 40 psi instead of 0. I tried adjusting the zero and setting screws but neither will bring it to zero.
I assume the gauge needs recalibration but that costs $125. Is there a way to do this myself?

[CraigAClark]

If you have moved the arrow to "Tare" when doing your "0" adjust and that plus the adjustment screws didn't work, I'm affraid you have no option but to send it back for calibration. I have been using these gauges since the late '90's and PSItronics is like the 4th company to handle them from the original manufacturer.

Craig

[jbscuba]

There is an on/off switch and Zero and setting screws. How do you move the arrow to "Tare" when doing your "0" adjust?

[CraigAClark]

Current units must not have the OEM features. I imagine that you have the APG manual? If not here an exerpt:

PG-5000 Rev. B2, 11/06
4
Automation Products Group, Inc.
APG...Providing tailored solutions for measurement applications
Tel: 1/888/525-7300 •Fax: 1/435/753-7490 •www.apgsensors.com• sales@apgsensors.com
• Instructions
NOTE: All units are factory calibrated prior to shipment.
1. Zero Trimming
NOTE: Some units are equipped with zero “knob”.
If it becomes necessary to re-adjust the “Zero” on the display, this can be
accomplished by turning the trimpot marked “Z” just to the left of the On/Off
push button. On the PG-5000 there is either a zero adjustment knob or a black
nylon cover screw. If the gauge has a cover screw, it is necessary to remove the
cover screw to access the zero adjustment pot. An ideal zero is indicated by a
reading of 000 with an intermittently flashing “-” sign.
NOTE: A jewelers screwdriver or an eyeglass repair screwdriver (supplied)
is a suitable instrument. Do not make changes to the Span adjustment (the “S”
pot to the right of the push button) as part of the zero trimming. The Span
should only be changed as part of the re-calibration of a gauge with a known
pressure source.
2. Use of Auto-Tare Feature
When the PG-5000 is first turned on you will notice that the display flashes
for the first 4 seconds. If the On/Off button is pushed and held during this
period, any existing reading will be re-set to zero. This allows the user to “Tare-
Out” a starting weight in hydraulic weighing applications. To remove the Tare
feature turn the unit off and back on again and do not push the On/Off button
during the flashing period.
3. Battery Replacement (9 Volt Type)
The battery can be replaced simply by removing the single screw at the top of
the battery door. Remove the old battery, unplug the cable connector and
replace with Eveready type 216 or equivalent. Replace the battery door and
secure with the self-tapping screw. (Do not overtighten)
NOTE: For best accuracy, re-calibration per step 4 should be performed at
the time batteries are replaced.
Rev. B2, 11/06 PG-5000
5
Automation Products Group, Inc.
APG...Providing tailored solutions for measurement applications
Tel: 1/888/525-7300 •Fax: 1/435/753-7490 •www.apgsensors.com• sales@apgsensors.com
4. Re-Calibration
This procedure requires a known pressure source of at least ±0.1% accuracy
in order to fully utilize the accuracy potential of the PG-5000 (If not available, the
gauge can be returned to APG for re-calibration.)
Procedure:
A. Ensure the Gauge is at 0 psig (or vacuum if absolute), and adjust the zero
as per instructions in step 1.
B. Apply full scale pressure to the pressure port and adjust the span (“S”)
pot until the display reads the correct pressure.
C. Re-check the zero and re-adjust the zero (“Z”) pot if required.
D. Repeat steps B and C, until no further adjustment is required.

Craig

[jbscuba]

THanks Craig, I will try the steps in your email. I appreciate the assistance.