Crystal Engineering M1 Digital Pressure Gauge

Crystal Engineering
Crystal Engineering

Key Features:

  • Bright easy to read 5 digit LCD backlit display
  • Stainless wetted parts for rough application
  • Waterproof housing - IP65
  • Max/Min reading capture
  • Data smoothing feature
  • Fast update rate, 4 per second (250 mSec)
  • Very broad temperature operating range
  • UV resistant ultra durable housing
  • Long 3 year battery life
  • Protective boot included
  • Shifts everyday wear to replaceable CPF adapter
Product Options:
Special Price $991.75 Regular Price $1,032.00

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The Crystal Engineering Model m1 digital test gauge boasts a 0.2% of reading accuracy over a wide temperature range. The m1 is affordable and extremely durable, replacing low cost mechanical gauges or cheap imported digital gauges.  The m1 is available in ranges from 30 to 10,000 psig and ships with a factory test report and a blue rubber boot.  For this price point, you will be hard to find a better more accurate digital pressure gauge than the Crystal m1.  It's time to start thinking of replacing your mechanical fleet of pressure gauges with the m1.


0 to 20% of Range:

± (0.04% of Full Scale)

Includes all effects of linearity, hysteresis, repeatability, temperature, and stability for one year.

20% to 110% of Range:

± (0.2% of Reading)

All models indicate vacuum, but vacuum specification applies to 15 psi, 30 psi, 100psi, and 300psi models only.


± (0.25% of Full Scale*)

Not recommended for continuous use below -14.5 psi.


* Full Scale = -14.5 psig

Refer to XP2i-DP data sheet for gauges that are intended for continuous high vacuum use.



Temperature Range:

-10 to 50°C (14 to 122°F)

Non-condensing. No change in accuracy over operating temperature range. Gauge must be zeroed to achieve rated specification.




5.5 digits
16.9 mm (0.67") high

LCD readable in sunlight with bright backlight.

Display Rate:

4 rdgs/sec (standard)



8 rdgs/sec (PSV Mode)

PSV mode is intended for Pressure Safety Valve testing, and requires software to enable.



3 x AA:

1500 hours, typical

Uses 3 alkaline AA (LR6) batteries. Use of backlight and/or RS232 reduces operating time.



Optional AC power supply available. Do not use AC power supply in hazardous locations.

Ultra Low Power:

Over 1 year, typical**

** 20 minute recording interval or greater in LT5 mode.



Digital Interface:

RS232, DB-9F

Free Labview drivers and programming instructions are available for download from website.



Do not use RS32 in hazardous locations.




32 000 data points

DataLoggerXP Firmware Update may be purchased at time of order, or in an Upgrade Package later.

Storage Type:

Flash memory

Software available for download from our website.

Minimum Interval:

1 second

Compatible w/ 32 & 64 bit Windows 7, and Vista.

Maximum Interval:

18 hours

Produces csv files, or used Excel template files (samples included) to automatically format and graph data.

Min. Event Duration:

250 mS***

*** Logging Type - Average with Peaks.




562 g (19.8 oz)

Weight includes batteries.



Submersible to 1 m for 30 minutes [IEC 60529].


Diecast aluminum

Nickel plating over low copper, marine grade aluminum.

Keypad and Labels:

UV Resistant Polyester

LCD protected from impact damage by 1.5 mm (0.06") thick polycarbonate lens under polyester window.



Skydrol compatible.



Wetted Materials:

316 stainless steel

All welded, with a permanently filled diaphragm seal.


and Viton internal o-ring (finger tight)

Metal to metal cone seal; O-ring can be removed if necessary.

Diaphragm Seal Fluid:

Silicone Oil

Optional connection on back.


Crystal CPF Female

1/4" male NPT adapter included unless BSP or M20 is specified.



1/4" medium pressure tube system compatible with HiP LM4 and LF4 Series, Autoclave Engr SF250CX Male and Female Series.



Temperature Range:

-40 to 75°C (-40 to 167°F)

Batteries should be removed if stored for more than one month.



The following requires the use of our free ConfigXP software.

User Defined Unit:

Allows the user to define and display any pressure units not included, or to use the gauge to display force, level, or other pressure related parameters. Reduce or increase displayed resolution.

PSV Mode:

Intended for pressure safety valve / burst disk testing. 8 readings per second. Captures point at which valve opens, as well as reseat pressure.


Smooths unsteady readings (1 to 10 samples).


Unwanted pressure units from Units button.


Peak pressure button.

Limit or Disable:

Zero button.

Password Protect:

Changes to configuration or calibration factor(s).


Configuration to a file.


Configuration to other gauges.



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*Not recommended for oxygen service

  • • Replaces 0.25% mechanical gauges
  • • Pressure regulator testing
  • • General pressure test and measurement
  • • Process gauge in high vibration / pulsation environment

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