Pilot High Low Pressure Sensor
The Axelson ESP Pressure Sensor is a highly accurate and reliable
device designed to detect an abnormal operating condition in a safety system and transmitting a signal to perform a specific shutdown function.
The Axelson ESP Pressure Sensor is a 3-way block and bleed valve that is controlled by a piston and spring.
It is used to sense predetermined pressure and, when that pressure is reached, shift the 3-way valve.
The actuation point is easy to adjust by turning the adjustment cap. This changes the spring force. Turning the cap clockwise will increase the pressure setting. Turning the cap counter clockwise will decrease the pressure setting.
The sensor may be used to detect
high pressure or a low-pressure conditions by connecting the input instrument pressure to the appropriate port. When connected to either port the remaining port becomes the exhaust port.
When used in a high pressure sensing application, the sensor allows flow through the instrument ports from "low" input to output as long as the sensing pressure increases to the high set point, the instrument input is blocked and the output is bled to the exhaust port.
When used in a low pressure sensing application, the sensor allows flow through the instrument ports from "low" input to output as long as the sensed pressure is above the low set pressure. When the sensing pressure decreases to the low set point, the instrument is blocked and the outlet is bled to the exhaust port.
Pilots can be connected in a series and used for both high and low sensing. The combination high and low pilot is called the ESPHL.
Sensing pressure range from .5 to 20,000 psi
Instrument pressure range up to 200 psi
Block-and-bleed 3-way valve
Designed for 3% repeatability of set point, or 5 psi, whichever is greater.
Minimum spread (dead band) between trip and reset pressure
Spring maybe be replaced with instrument and sensing pressures present
Vent in lower housing provides warning if body is accidentally loosened from lower housing with sensing pressure present
Available to conform to NACE Standard MR-01-75
Corrosion resistant 316 stainless steel used throughout with Inconel spring optional.
Sensing pressure connections:
9/16" HP on high-pressure sensors (20,000 psi)
¼" NPT on low pressure sensors (diaphragm type)
½" NPT on all other sensors
Metal-to-Metal seal between stem and body is designed to prevent flow line pressure or fluids from entering instrument pressure system if O-ring seal fails when sensor is in Fail-Safe Position
Vent acts as a warning allowing sensing pressure to bleed out prior to disengaging body from piston housing
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PRESSURE SENSOR SENSING RANGES & PART NUMBERS:
BASE NUMBER - 41046-XXX (Standard Body) EXAMPLE:
High Flow Body - 41046-XXX3 (use 3 to indicate high flow)
|Sensing Pressure Range
||Sensing Unit & Spring
|0.25 - 5.3 PSI
||4" Diaphragm w/Ultra Light Spring
|0.5 - 20 PSI
||4" Diaphragm w/Light Spring
|1 - 40 PSI
||4" Diaphragm w/Heavy spring
|0.5 - 20 PSI
||2" Diaphragm w/Ultra Light Spring
|1 - 100 PSI
||2" Diaphragm w/ Light Spring
|2 - 200 PSI
||2" Diaphragm w/ Heavy Spring
|1 - 60 PSI
||1-1/8" Piston w/Ultra Light spring
|10 - 125 PSI
||1-1/8" Piston w/Light spring
|75 - 550 PSI
||1-1/8" Piston w/Heavy spring
|300 - 1,000 PSI
||1/2" Piston w/Light Spring
|500 - 2,000 PSI
||1/2" Piston w/Heavy Spring
|1,900 - 5,000 PSI
||1/4" Piston w/Light Spring
|4,900 - 10,000 PSI
||1/4" Piston w/Heavy Spring
|10,000 - 20,000 PSI
||3/16" Piston with Heavy Spring
HIGH FLOW ESP:
The ESP Sensor is also available with a high flow
rate. The High Flow Rate Body provides increased flow capacity and
increased pressure capacity through the instrument ports. This
allows the sensor to be used as a block and bleed valve with
faster reaction times for the system. It may also be used
as a 2-way valve on a bleed only system.
Instrument Pressure - 600 psi Maximum
Instrument Pressure Range
Standard Body ............. 200 psi max.
High Flow Rate Body ...... 600 psi max.
NOTE: When using a
urethane o-ring on the stem - 1,480 psi maximum instrument
Repeatability to Set Point
within 3% of set point
Cv Factor (Flow Capacity)
Standard body ........ 0.028
High Flow Rate Body ..... 0.058
Dead Band (Spread) ......................... Percent
1 1/8, 1/2, 1/4 in. Pistons ................
Diaphragm Types ............................... 3%
3/16 in Piston .................................... 10%
AXELSON ESP SPRING COLOR CHART:
ULTRA LIGHT - WHITE SPRING
LIGHT - ORANGE SPRING
HEAVY - BLUE SPRING
MAINTENANCE FOR THE ESP SENSOR:
(1) Cycle Test once a month or more often if
(2) Disassemble, inspect all parts, and replace
O-rings annually or more often if service dictates.
TO ORDER ORING KITS -
ESPVITONKIT - Viton O-ring Kit
ESPBUNAKIT - Buna O-ring Kit
Urethane O-ring needs to be specified and can be added to the
(3) To change spring: with flow line pressure at
port D, loosed locknut and remove the cap. Replace spring
and reassembly. (See spring part numbers below.)
Spring Part No: (2nd Digit)
41047 - Light-Steel Spring (Orange)
41048 - Heavy-Steel Spring (Blue)
41049 - Light-Inconel Spring (Yellow)
41050 - Heavy- Inconel Spring (Green)
46301 - Ultra-Light-Steel Spring (White)