 |
|
Ashcroft®
Accessories |
Throttling
Devices
A throttling device should be used when a
pressure gauge is subjected to rapid pressure fluctuations,
which make the gauge difficult to read because of rapid
pointer movement. Such a device reduces pressure impact,
slows the speed and range of pointer movement, and prolongs
gauge life.
Throttling effect is obtained by installing a restricting
orifice between the gauge socket connection and the bourdon
tube. Several types are available: throttle screws, pressure
snubbers, pulsation dampeners, Gauge Saver® and the
Campbell MICRO-BEAN. |
|
Severe
service applications are characterized by the presence of
significant levels of pressure pulsation and/or vibration.
Gauges should be protected from severe pressure pulsation by
the inclusion of a dampener such as a throttle plug/screw or
a porous metal snubber. If the pulsation is extreme, a
liquid-filled gauge, with dampener, should be used. A
liquid-filled gauge will also last signifcantly longer than
a comparable dry gauge when vibration is present. If the
vibration levels are extreme, the only solution may be to
remotely mount the gauge away from the source of vibration.
In that case flexible tubing may be used to connect the
gauge to the pressure source. |
| PRESSURE
SNUBBER |
|
 |
| |
|
Type
Number |
NPT
Conn. |
Material |
Max
psi |
| Housing |
Filter
Disc |
Rating |
25-1112B
50-1112B |
¼
½ |
Brass |
316
SS |
10'000 |
25-1112S
50-1112S |
¼
½ |
303
SS |
316
SS |
15'000 |
|
|
Used for
dampening and filtering, the snubber has a metal disc
available in four standard grades of porosity. The one best
suited for the application can be selected from the chart,
using the same guidelines as for throttle screws. Due to the
large filter area, the snubber has less tendency to clog
than orifice-type devices. All-metal construction permits
the snubber to be washed in a variety of common solvents. |
|
Please refer to the CHEMIQUIP
section for more detailed information on Pressure Snubbers
| THROTTLE
SCREWS |
|
 |
| |
|
| The
simplest means of providing a restriction in the socket, a
throttle screw, should be ordered with the gauge. Threaded
or pressed into an instrument socket, the throttle screw
orifice selected is based on the viscosity of the pressure
fluid, rapidity of the fluctuations, and the amount of
dampeninig effect desired. |
|
A
smaller orifice should be used for low viscosities, high
frequencies, high pressure and reduced pointer amplitude. To
accommodate these variables, throttle screws are available
in these sizes: 0.006, 0.0135, 0.020, 0.031, 0.040 and 0.070
inches, in brass or stainless steel. When orifice size or
service is not specified, a 0.031 -inch orifice will be
supplied.
|
|
| PULSATION
DAMPENER |
|
 |
| |
|
| Threads
onto a gauge socket and provides restriction by means of a
moving pin, which may be placed in either of five different
sized holes, and thus allows the user to vary the amount of
dampening to suit requirments. The pulsating pressure moves
the pin up and down, providing a self-cleaning action.
Dampeners are shipped with a pin in the "middle"
hole, and may be used in either a vertical or horizontal
position. Maximum pressure is 5000 psi. |
|
Type
Number |
NPT
Conn. |
Material |
Weight |
| 25-1106B |
¼ |
Brass |
4 |
| 50-1106B |
½ |
Brass |
8 |
| 25-1106D |
¼ |
Steel |
4 |
| 50-1106D |
½ |
Steel |
8 |
| 25-1106S |
¼ |
Stainless
Steel |
4 |
| 50-1106S |
½ |
Stainless
Steel |
8 |
|
|
| SIPHONS |
|
 |
| |
|
In order
to prevent live steam from entering a pressure gauge bourdon
tube, a siphon filled with water should be installed between
the gauge and the process line. If freezing of the
condensate in the loop of a siphon is a possibility, a
diaphragm seal should be used to isolate the gauge from the
process steam. Also use siphons whenever condensing hot
vapors (not just steam) are present.
|
|
- Pig Tail Siphon-Number 1100 Series,
¼",½" sizes: to 500psi and 400°F.
- Coil Pipe Siphon-Number 1098
Series, ¼",½" sizes: to 9550psi and 400°F.
|
Type
Number |
NPT
Conn. |
Material |
Capacity |
| 25-1098
I |
¼ |
Iron |
500psi
& 400°F |
| 25-1098
B |
¼ |
Brass |
250psi
& 400°F |
| 25-1098
S |
¼ |
ASTM
A-106 Seamless Steel Grade A |
338psi
& 1000° to 3360psi
& -20° to 400°F |
| 50-1098
S |
½ |
ASTM
A-106 Seamless Steel Grade A |
333psi
& 1000° to 3000psi
& -20° to 400°F |
| 50-1098
SD |
½ |
ASTM
A-106 Seamless Steel Grade A |
420psi
& 1000° to 3740psi
& -20° to 400°F |
| 50-1098
CD |
½ |
ASTM
A-106 Seamless Steel Grade A |
1048psi
& 1200° to 9550psi
& -20° to 400°F |
| 50-1098
NS |
½ |
Seamless
Stainless
Steel, Type 316 |
294psi
& 1500° to 3981psi
& -20° to 100°F |
| 50-1098
ND |
½ |
Seamless
Stainless
Steel, Type 316 |
336psi
& 1500° to 5840psi
& -20° to 100°F |
| 25-1100
A |
¼ |
Seamless
Stainless |
500psi
& 400°F |
| 25-1100
I |
¼ |
Iron-6
3/8;" Long |
| 25-1100
IL |
¼ |
Iron-8"
Long |
| 25-1100
IN |
¼ |
Iron-Angle |
| 25-1100
B |
¼ |
Brass-5
3/8" Long |
250psi
& 400°F |
| 25-1100
BL |
¼ |
Brass-8"
Long |
|
|
| ELECTRIC
WARNING CONTACTS |
|
Indicating accuray of Ashcroft Duragauge,
above 300psi with contact:
Pointer not carrying contact - 1%
Pointer carrying contact - 1.5%
For ranges below 30psi, add an additional ½% to indicating
accuracies. |
| |
|
The
Ashcroft® 2265 electric contact is an ideal accessory to
turn on a signal light, sound an alarm, or operate a pump or
valve. The contacts can easily be set so that a circuit can
be closed or opened at a desired pressure or temperature.
Settings can be easily made in the field without removing
the instrument from service. Contact adjustment is made
externally with a removable key to make the instrument
virtually tamper proof.
The contact is designed for easy installation on Types 1279,
1377 and 1379 Duragauge® pressure gauges (either stem or
flush mounted), Type 1125 differential pressure gauges, or
Type 600A Duratemp dial thermometers. Contacts
are equipped with adjustable magnets to eliminate chatter
caused by vibration. A plug-in connector with five feet of
electrical cable is standard. |
|
| Use
with Ashcroft Model No. |
Description |
Availability |
| Code |
Mounting |
| 45 |
60 |
| 4½"
Dial |
6"
Dial |
Stem |
Flush |
1279
1377
1379 |
Duragauge
pressure gauge |
X
X
X |
-
X
X |
X
-
X |
X
X
X |
| 1125 |
D/P
gauge |
X |
X |
X |
X |
| |
Surface |
Flush |
600A-02
600A-03
600A-04 |
Duragauge
remote thermometer |
X
X
X |
X
X
X |
-
X
X |
X
X
X |
| Model |
Code |
Contact
arrangements |
| 2265 |
XED |
High
and low contact |
| XEE |
Double
high contact |
| XEF |
Double
low contact |
| XEG |
"OFF"
at low and high,
and "ON" in between |
|
|
| CONVERSION
KITS (LIQUID-FILL KITS) |
| |
|
|
For field
converting 4½" 1279 and 4½" and 6" 1379
Duragauge® gauges to a sealed case design suitable for either
hermetic sealing or liquid filling.
Kit Includes
- O-ring for front case seal.
- Acrylic window.
- Elastomeric diaphragm (Buna-N) for
rear case seal.
- Glass filled polypropylene threaded
ring for rear of case.
- 302 stainless steel rear cover and
mounting screws.
- 303 stainless steel and Monel
throttle screws.
- O-ring for socket seal.
|
|
 |
| HOW
TO ORDER CONVERSION KITS (LIQUID-FILL KITS) |
| |
|
|
- 4½" size, lower connected -
order type A1280 Kit.
- 4½" size, back connected -
order type A1283 Kit.
- 6" size, lower and back
connected - order type A1284 Kit.
|
| TOOLS |
| |
|
|
|
Hand Jack Set
Gauge pointer remover and a pointer set to secure pointer to
the shaft. Type No. 3220
|
|
 |
|
Ring Removal - For
the 2½" and 3½" 1009 gauge. Includes 2½"
and 3½" wrench and nest. Type No. 1206T
|
|
|
Small Tools - For
the 2½" and 3½" 1009 gauge. Includes pointer
puller, span adjust wrench, slotted screw driver for pointer
adjustment, pointer staker and pinion backup Type
No. 1205
|
|
|
Gauge Tool Kit
- A complete kit for gauge maintenance. Includes hand jack
set, screw driver, five reamers, pin vise holder, wiggler
and tweezer all packed in a neat carrying case. Ideal for a
gauge maintenance shop. Type
No. 1105T
|
|
| Type
A1285 Ring Wrench - 4½" |
| For installing front
or rear threaded rings in 4½" Duragauge gauge. |
|
 |
| Type
A1286 Ring Wrench - 6" |
| For installing front
or rear threaded rings in 6" Duragauge gauge. |
|
 |
| Type
A-1287 Cone Tool |
| For installing
diaphragm and garter spring on back connected liquid filled
or hermetic sealed Duragauge gauges. |
|
 |
| Type
A-1281 Socket O-Ring Insertion Tool Kit |
| For lower connection
type 4½" - 1279 and 1379 and 6" - 1379 Ashcroft
Duragauge gauges. |
|
 |
| 1-877-ASHCROFT |
Credit Cards Accepted by PSI
 |
|
