Ashcroft DG25 User manual

1
Ashcroft Inc. 250 East Main Street, Stratford, CT 06614 USA
Tel: [phone], Fax: [phone] www.ashcroft.com
All sales subject to standard terms and conditions of sale.
© 2017 Ashcroft Inc. I&M006-10197 DG25 02/2017
Installation and Operating
Instructions for General
Purpose Digital Pressure
Gauge Type DG25
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(if possible), pumps should be brought up to
power slowly, and valves opened slowly. To
avoid damage from both fluid hammer and
surges, a surge chamber should be installed.
Symptoms of fluid hammer and surge’s dam-
aging effects:
• Digital Gauge exhibits large zero offset.
• Digital Gauge pressure display remains
constant regardless of pressure
• Error code is displayed on screen.
FREEZING:
Prohibit freezing of media in pressure port.
Unit should be drained. (Mount in vertical po-
sition to prevent possible overpressure
damage from frozen media.)
3. INSTALLATION:
This procedure requires the use of a 11⁄16˝
(27mm) hex wrench for tightening the in-
strument to the process connection. Apply
Teflon tape or a suitable sealing compound
to NPT threads of the gauge. Take using the
wrench, tighten 1 turn beyond hand-tight
or until a leak-proof seal has been
achieved.
C ution: Tightening the product by
grasping or putting a tool on the plastic
housing can cause permanent damage to
the product.
3



WARNING! READ BEFORE INSTALLATION
1. GENERAL:
A failure resulting in injury or damage may be
caused by excessive overpressure, excessive
vibration or pressure pulsation, excessive in-
strument temperature, corrosion of the pres-
sure containing parts, or other misuse.
Consult Ashcroft Inc. Stratford, Connecticut,
USA before installing if there are any ques-
tions or concerns.
2. OVERPRESSURE:
Pressure spikes in excess of the rated over-
pressure capability of the gauge may cause
irreversible electrical and/or mechanical
damage to the pressure measuring and con-
taining elements. Fluid hammer and surges
can destroy any pressure transducer and
must always be avoided. A pressure snubber
should be installed to eliminate the damaging
hammer effects. Fluid hammer occurs when
a liquid flow is suddenly stopped, as with
quick closing solenoid valves. Surges occur
when flow is suddenly begun, as when a
pump is turned on at full power or a valve is
quickly opened.
PRESSURE SURGES:
Surges are particularly damaging to pressure
gauges if the pipe is originally empty. To avoid
pressure surges, fluid lines should remain full
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4. GENERAL INFORMATION:
Keyp d:
Power On-Off / Enter 

|
|
Zero / Up Arrow / Tare 
ZERO Tare
Menu Selection / Down / Backlight Arrow 
MENU 
ey presses are short less than 0.5 seconds or long greater than 0.5 seconds



➟
➟
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




LCD DISPLAY:
LCD functions:
5 numerical digits for pressure display.
20 segment pressure range bar graph – each segment equals 5% of range.
 Sleep and Backlight Timer symbols.
Maximum / Minimum Pressure and Tare icons.
5 character alpha-numeric digit display.
4 segment battery life indicator.
Negative pressure indicator.

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Note: Key presses designated as short (less
than 0.5 sec) are indicated by “➟
” ICON
Key presses designated as long (greater than
0.5 sec.) are indicated by “
➟
” ICON
Turn the G uge ON/OFF
Press 

|
|
➟
key to turn instrument ON /
OFF. When initially turned ON, the display will
momentarily show all LCD segments lit, prod-
uct version and full scale range; the unit will
then proceed automatically to the Measure-
ment Mode.
Zero Function:
Press 
ZERO
➟
. Upon release, the numeric
display momentarily disappears and “ZERO”
shows in alpha display, then returns to meas-
urement mode. The pressure should now read
0. Zero value is stored in memory.
Note 1: A display message of “RLOC ” indi-
cates that zero is more than ±5% from factory
calibration. Zeroing is not possible.
Note 2: A message of “ZLOC ” indicates that
zero lock function is activated.
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Progr mming:
To enter menu mode
1. Press 
MENU
➟
and release to proceed
to programming mode.
2. Press 
, 
 ➟
, to scroll through pro-
grammable menu options.
3. When desired option is reached press


|
➟to access that parameter.
4. If at any time you choose to EXIT the
menu mode (or sub-menu mode) hold

MENU
➟
. Your work will not be saved.
Progr mm ble P r meters:
Units of Me sure:
1. In Menu mode, press 
, 
➟, to
scroll to “UNITS”, press 

|
|➟.
2. Choose engineering units by scrolling

, 
➟, until desired unit is dis-
played, “PSI, BAR, kg/cm, kPa, mPa,
FtH2O, InHg, cmHG, mmHg, customer de-
fined units (CUSTU)”.
3. Press 

|
|➟to select units and return to
Measurement Mode.
Note: Custom units programming, see page 8.
7
T re Function:
Subtracts current pressure value from value
displayed in Measurement mode.
In Measurement mode, apply desired pressure
press 
ZERO ➟, to enable the tare function. The
display will quickly flash “TARE”, then the
“TARE” icon will be displayed and the pressure
reading will blink. The unit should now read 0.
Press 
ZERO ➟the TARE key ICON again to dis-
able the function. The display will quickly flash
“T OFF”, then the “TARE” icon will disappear
and the pressure reading will no longer be
blinking. The unit will now return to measure-
ment mode.
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Custom Units of Me sure
Allows a user to define a custom unit of meas-
ure, user must enter the full scale value of the
desired reading, which can be done as follows.
1) In Menu Mode press 
, 
➟select
“CUSTU” press 

|
|➟.
2) Select decimal point location:
The alphanumeric display shall show “SELDP”
The first screen to appear will show all digits
lit up as “5” and the rightmost decimal point
will blink (5 5 5 5.5) unless the custom units
feature had been used previously. If it had
been used, the digits and decimal point po-
sition shall correspond to the last values set.
Use the 
, 
➟keys to move the deci-
mal point to the left or the right. Once the
decimal point is in the desired position,
press 

|
|➟to lock it in place. When the
key is released the display reads “DIGIT”.
3) Choose full scale value:
The alpha numeric display shall show “DIGIT”.
The next screen will continue to show all
digits as “5”, with the leftmost digit blinking
and the decimal point fixed in the previously
chosen position. However, if the custom
units feature has been used previously, then
the digits shall correspond to the last value.
The decimal point remains at the location
chosen in step 1. Press 
, 
➟to
change the value of the digit between 0-9.
Once the desired value is displayed, press
the 

|
|➟button to lock it in place. Now
the next digit to the right will begin blinking.
Repeat this procedure for all 5 digits. When
the 

|
|➟is pressed and released with the
fifth digit flashing, the gauge will briefly dis-
play “DONE” then return to measurement
mode and display “CUSTU” along with the
numeric readings to signify that the feature
is use.
The user can optionally exit at any point
before the enter key is pressed with

MENU
➟
. If the user exits the menu by a

MENU
➟
before completing step 2 or
there is a menu timeout, then whatever the
user entered will be lost.
Note: The custom units feature is not avail-
able with compound pressure ranges.
Note: The bar graph uses the factory default
setting when custom units are used.
Note: The magnitude of the value entered
when using the custom units feature can
significantly increase the noise on the dis-
play, which can affect the zero and tare
functions as well as the stability of the pres-
sure reading displayed. If required, consult
factory for recommended limitations on full
scale input.
8
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Timer:
Controls how long the gauge will remain pow-
ered ON once the Power key 

|
|is pressed.
1. When in menu mode press 
, 
➟
to scroll until “TIMER” is displayed.
2. Press 

|
|➟.
3. Then, press 
, 
➟to scroll
through values. “NONE” designates that
the gauge will remain ON until the
power key 

|
|is pressed a second
time. Any other value (1 min [default] /
5 min / 20 min), other than “NONE”, will
designate the duration of time this func-
tion will be in effect.
4. Press 

|
|➟to select desired value;
timer icon will be shown on the display
and the unit will display “DONE” then re-
turn to Measurement Mode.
Fe ture: Timer icon will flash 10 seconds
prior to gauge shut down.
M ximum / Minimum:
Displays maximum / minimum pressure values;
this is initiated upon powering the unit or since
the values were cleared.
1. When in menu mode press 
, 
➟
to scroll to ‘Max’ (maximum display);
this is indicated in small font to the left
of the display’s unit of measure.
2. To clear both Min and Max values, press
and hold 
ZERO
➟
.
3. Release of this key will leave you in
Menu mode. Use 
, 
➟to
continue scrolling through the menu
options, OR hold, 
MENU
➟
to return
to measurement mode.
Note: Clearing Minimum / Maximum
values will reflect a blank display except
for the associated Min. / Max. icon and
battery indicator.
Note: The following actions will also
clear min/max values. Power off, zero
gauge function, tare function, field cali-
bration function, units programming,
update rate, or reset.
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Light:
Determines how long the back light will remain
ON after any key is pressed in Measurement or
Menu Modes (Note: The timer is reset with any
key being pressed.)
1. While in Menu mode, press 
, 
➟
until “LIGHT” is displayed.
2. Press 

|
|➟for timer value to appear;
“ON” refers to the back light remaining
ON at all times unit is powered ON,
“PRESS” designates that the back light
is switched on / off by briefly pressing
the backlight 
MENU ➟whereas, “OFF” in-
dicates the back light will never be illu-
minated. Selecting time values, “1 MIN”
(default), “5 MIN”, “20 MIN”, will acti-
vate the backlight symbol on the LCD
display for the designated minutes.
3. Press 

|
|➟to select back light time
(display will briefly show “DONE”) and
return to Measurement Mode.
Note: In “PRESS” mode; factory has set 1
hour timer to save battery.
Fe ture: Back light indicator will blink 10 sec-
onds prior to light shut off.
Upd te:
Utilized to select the rate at which the displayed
pressure value is updated on the screen. This
function is used when rapid changes in pres-
sure cause “flutter” in the display values;
longer intervals will reduce the update rate and
“average” the readings on such applications.
1. In Menu mode, press 
, 
➟until
“UPDAT” appears.
2. Press 

|
|➟to select.
3. Press 
, 
➟to select values for
“1 SEC” (default), “500 MSEC”, or “250
MSEC”.
4. Press 

|
|➟to select value (display will
briefly show “DONE”) and return to
Measurement Mode.
Note: Changing value to anything other than
1 sec may cause a slight zero offset, and it
is recommended that the gauge be fully
vented and re-zeroed before taking accurate
readings. Also, battery life will be reduced
by use of an update rate faster than 1 SEC.
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Z-Lock:
Utilized to prevent inadvertent re-zeroing of the
instrument.
1. In Menu mode, press 
, 
➟until
“ZLOC ” appears.
2. Press 

|
|➟to select.
3. Press 
, 
➟to select “L ON” or “L
OFF” (default).
4. Press 

|
|➟to select value (display
will briefly show “DONE”) and return to
Measurement Mode.
Note: If Z-Lock is activated, the gauge will
display “ZLOC ” if zero is attempted.
Re-C libr tion:
Provides the user the ability to field calibrate the
product. Original factory calibration is perma-
nently retained in memory and can be recalled at
any time.
1. In menu mode press 
, 
➟until
“RECAL” appears; proceed to press


|
|➟.
2. Display will indicate “FACT” (factory)
“FIELD” or “NEW’ press 
, 
➟to
scroll.
3. Pressing 

|
|➟while “FACT” (factory) is
displayed will restore values of factory
calibration.
4. Pressing 

|
|➟when “FIELD” is dis-
played will restore values from latest field
calibration.
5. Pressing “Enter” key 

|
|➟when “NEW”
appears will enter the recalibrate mode.
6. When “NEW” is displayed, press 

|
|➟;
upon release, display will flash CNFRM or
CANCEL press 
 or 
to select then
press “Enter” key 

|
|➟, then the dis-
play will flash CNFRM press ENTER “O /
APPLY/ REF/ PSI/ THEN/ PRESS/ ENTER/
TO/ START/ OR/ OTHER/ TO/ ABORT”.
Numeric display will read .00000. Vent
sensor to atmospheric pressure, press


|
|➟display will show “WAIT” and
count down from 6 seconds then briefly dis-
play CAL then automaticly go to next step.
7. Display flashes “APPLY/ REF/ PSI/ THEN/
PRESS/ ENTER/ TO/ START/ OR/ OTHER/
TO/ ABORT”; apply the full scale pressure
in units of psi indicated in numeric display
to gauge. Press 

|
|➟display will show
“WAIT” and count down from 6 seconds
then briefly display CAL then automati-
cally go to next step.
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8. Display flashes “APPLY/ REF/ PSI/ THEN/
PRESS/ ENTER/ TO/ START/ OR/ OTHER/
TO/ ABORT”; apply the pressure indicated
in numeric display to gauge and press


|
|➟display will show “WAIT” and
count down from 6 seconds then briefly
display GOOD then exit into measure-
ment mode, or
9. COMPOUND RANGE GAUGES ONLY RE-
QUIRE ONE ADDITIONAL CALIBRATION
POINT NEAR VACUUM
10. Display flashes “APPLY/ REF/ PSI/ THEN/
PRESS/ ENTER/ TO/ START/ OR/ OTHER/
TO/ ABORT”; apply near vacuum of
–14.000 psi as indicated in numeric
display to gauge and press 

|
|➟,
display will show “WAIT” and count
down from 6 seconds then briefly display
“GOOD” then exit into Measurement Mode.
Note: Recalibration is allowed only if test
parameters are within ±7%. If outside this
window, the display will indicate “CAL FAIL /
INPUT PRES TOO LOW (HIGH) / PRESS
ENTER TO RETRY / PRESS OTHER TO ABORT”.
Note: “FIELD” option appears only if gauge
has been successfully field recalibrated.
Gr ph:
Provides the user the ability to modify pressure
values dictating the minimum / maximum indi-
cations over the 20 segment bar graph.
1. In menu mode press 
, 
➟
,
until “GRAPH” appears; press 

|
|➟
.
2. Display will indicate “CGOFF” (custom
graph off) [default], “CG ON” (custom
graph on), or “NEWCG” (new custom
graph) press 
, 
➟to scroll.
3. To recall the last custom graph entered
when “CG ON” is displayed press


|
|➟. Display will briefly show
“DONE” and return to Measurement
Mode.
4. To reset bar graph to full scale range;
when “CGOFF” is displayed press 

|
|
➟Display will briefly show “DONE”, and
return to Measurement Mode.
5 To enter a new custom bar graph; when
“NEWCG” is displayed press 

|
|➟
.
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6. To program minimum graph percentage,
the display will indicate 0 0 with the right
digit flashing, the bottom most segment
of the bar graph will flash, and the dis-
play will read “PCTFS” (percent full
scale). Press 
, 
➟to scroll to a
num-ber 0-9. Press 

|
|➟to select that
num-ber. The left digit will now begin to
flash. Press 
, 
➟
. to scroll to a
number 0-9. 

|
|➟
. to select that
number. The 2 digit number entered
represents the percentage of full scale
to be used as the low end of the graph
(0-99%).
7. To program maximum percentage of full
scale the display will indicate 1 0 0 with
the right digit flashing, the upper most
segment of the graph will flash, and the
display will read PCTFS (percent full
scale). Press 
, 
➟
. to scroll to
a number 0-9. Press 

|
|➟to select
that number. The left 2 digits will now
begin to flash. Press 
, 
➟to
scroll to a number 0-10. Press 

|
|➟to
select that number. The number entered
represents the percentage of full scale
to be used as the high end of the graph.
Note: 100 is the highest and only possi-
ble 3 digit number. If the low number is
equal to or larger than the high number,
the unit will flash “REJCT”
and it will exit back into the “GRAPH”
sub-menu.
Note: Custom graph function is not available
on vacuum and compound ranges.
Note: A display message “ULOC ” indicates
that custom units are being used and bar
graph minimum and maximum are set to
the factory defaults
Reset:
Returns the product to the factory default val-
ues.Preserves field calibration. Factory calibra-
tion can be restored in the “RECAL” menu.
1. In menu mode 
, 
➟until
“RESET” appears on display’s lower line;


|
|➟
.
Factory defaults pertain to units, timer,
back light, update rate, zero lock.
Display will indicate “DONE” then gauge
will switch to “OFF” condition.
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14
Ch nging B tteries:
Grip knurled back cover and rotate counter-
clockwise until the ‘unlock’ icon is in alignment
with the arrow – this is on the housing at the
base of the pressure connection.
Remove cover by pulling straight back
and replace AA alkaline batteries accordingly;
ensure that the batteries are in the proper
polarity position.
For reattachment of cover, align the ‘unlock’
icon with the arrow, push cover straight in
then turn clockwise until the arrow is in
alignment with the ‘Lock’ icon.
Note: Reinstallation of the back cover may
cause the unit to read negative pressure.
This is a temporary issue as the internal case
pressure will be relieved by the case vent and
equalize with atmospheric pressure (90% of
the offset will equalize within 1 minute, the
remaining 10% may take up to 5 minutes).
WARNING: Misuse
may cause injury or
damage. Refer to
ASME B40.100
WARNING: Misuse
may cause injury or
damage. Refer to
ASME B40.100
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15
27mm
1.063in
Hex
67mm
2.64in
50.5mm
1.99in
69.36mm
Ø
2.73in
1/4 NPT Male
Ø
40.9mm
1.61in
67.6mm
2.66in
17.5mm
.69in
Pressure R nge:
Proof
Pressure: Vac-2000psi 200%
% of Sp n 3000-5000psi: 150%
7500-25,000psi: 120%
Burst
Pressure: Vac-2000psi: 800%
% of Sp n 3000-5000psi: 500%
7500-25,000psi: 300%
Environment l Specific tions:
Temper ture
Stor ge: Batteries removed:
–20°C to 80°C (–4°F to 176°F)
Batteries installed:
–20°C to 60°C (–4°F to 140°F)
Ambient Oper ting:
–20°C to 60°C (–4°F to 140°F)
Process Medi :
–20°C to 80°C (–4°F to 176°F)
Agency Approv ls:
CE
Annex A (Heavy Industrial)
UL/cUL- 61010-1 (File E171189, Vol. X1)
RoHS compliant
Dimensions:
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#
Ashcroft Inc. 250 East Main Street, Stratford, CT 06614 USA
Tel: [phone], Fax: [phone], www.ashcroft.com
All sales subject to standard terms and conditions of sale.
© 2017 Ashcroft Inc. I&M006-10197 DG25 02/2017
DG25 I&M006 10197.qxp_I&M006 10197 2/6/17 12:54 PM Page 16