Pilots for Control Systems

Quick Links to Information Below

• HLU Universal High-Low Pilot
• High-Low Direct Dial Pilots for Control Systems
• High-Low Piston Stick Pilots for Control Systems
• High-Low Pilots Manifold Assembly for Control Systems

PDF Documents

• Well Control Solutions
• Well Control Solutions - Spanish Version
• HLU Universal High-Low Pilot
• HLU Universal High-Low Pilot - Spanish Version

HLU Universal High-Low Pilot

The Pneu-Hydro Model HLU high or low-pressure pilot is designed to protect equipment and installations against abnormal pressures. The assembly operates as a normally open block-and-bleed device for sensing undesirably low or high-pressure conditions. The sensing element can be readily converted from one pressure range to another by reconfiguring its components. All needed parts and diagrams are included with every assembly and conversion can be made by field personnel as operating requirements change.

The pilot body is patterned after the HL-2 design which has years of proven reliability and reflects the same high precision and quality all Pneu-Hydro products are known for.

Features of the HLU Universal High-Low Pilot

• Complete range of pressure settings within a compact package
• Four unique configurations to respond to pressures ranging from 25 to 10,000 PSI (1.7 to 689.5 BAR)
• Constructed of materials in accordance with NACE MR0175-91
• Standard type 316 stainless steel components can be fabricated from practically any alloy, including:
  • Hastelloy
  • Monel
  • Inconel
  • Duplex

HLU Universal High-Low Pilot Specifications

Supply Pressure	125 PSI maximum (8.5 BAR maximum)
Operating Temperature	-20° to +250°F (-29° to 120°C)
Weight	~3.7 lb. (~1.7 kg.)
Production Test Pressure	1.5 x sensed pressure (10,000 PSI minimum)
Set Point Repeatability	<1% of set pressure
Hysteresis or Deadband	<10% of full range

Ordering Information

434201	Low pressure sense head assembly, 25 - 150 PSI (1.7 - 10.3 BAR)
434202	Intermediate pressure sense head assembly, 100 - 600 PSI (6.9 - 41.4 BAR)
434203	Medium pressure sense head assembly, 400 - 2,500 PSI (27.6 - 172.4 BAR)
434204	High pressure sense head assembly, 1,600 - 10,000 PSI (110.3 - 689.5 BAR)

High-Low Direct Dial Pilots for Control Systems

eP’s CAC SDA® dial-adjustable pilots offer accurate, reliable operation and feature full stainless steel construction to insure years of dependable operation even in the most severe applications. To further protect each pilot from the elements, every pilot is mounted in a lockable weather-tight fiberglass or 316 stainless steel case. Models are available to sense a wide range of pressures to 10,000‑PSI. Standard supply and output pressure is 30-PSI, with other pressures available.

Model SDA

Model SDA features two independently operating pilots, one for high pressure and one for low pressure. A fully instrumented panel is standard, showing sensed pressure and output pressure. Two separate dials select high and low pressure trip points.

Nominal Supply Pressure	30-PSI (2.07 bar)
Low Set Point Repeatability	1% full scale
High Set Point Repeatability	1% full scale
Hysteresis Dead Band (Trip or Reset) when Output Signal Restored Automatically	5%
Weight	18.5 lbs (8.4 kg)
Operating temperature
Standard, H2S, CO2	-20° to 180°F (-29° to 82°C)
Arctic	-75° to 180°F (-60° to 82°C)
Dimensions
Stainless Steel	12.5” W x 13” H x 8” D
Fiberglass Enclosure	12.75” W x 12.75” H x 8” D

CAC SDA Selection Chart
Model SDA	PSI
	100	1,000	2,000	4,000	10,000
Maximum Test Pressure	160	1,500	3,000	5,000	10,000
Pressure Sensor Ranges	15-100 10-50 6-25	100-1,000 50-500 25-250	200-2,000 150-1,500 100-1,000 50-500 25-250	600-4,000 600-3,000 600-2,000 400-1,000	1,600-10,000 600-4,000 600-3,000 600-2,000 400-1,000
Sensing Gauge	0-1,500	0-1,500	0-3,000	0-5,000	0-15,000

Model SDE

Model SDE® is a single pilot model which senses either high or low pressure. This pilot is fully instrumented with gauges for sensed pressure and output pressure.

Model SDEP

Model SDEP® is the panel mountable version of the SDE and is supplied without the instrument gauges and fiberglass case. The SDEP model is usually used in a control panel.

eP’s high-low direct dial pilots include the following options:

High-Low Piston Stick Pilots for Control Systems

eP’s CAC HL-2® high or low pressure pilot is designed to protect equipment and installations against abnormal pressures. It is available in pressure ranges to 15,000-PSI and can operate as a normally open block-and-bleed high pressure or closed block-and-bleed low pressure device for pneumatic or hydraulic service.

HL-2 pilot bodies and sense heads are available in any combination of the following five materials:

• 16 stainless steel (standard)
• Hastelloy
• Duplex stainless steel
• Inconel 625
• Monel 400

High-Low Pilots Manifold Assembly for Control Systems

Any two of eP’s CAC HL-2 pilots can be mounted on a manifold to produce a high-low (PSHL) assembly for pressures to 10,000-PSI. Any two ranges can be used with consideration of the maximum working pressure for the low pilot. The pilots are block-and-bleed valve devices. One is set to monitor low pressure and the other high pressure. A common pressure is sensed through the manifold block. If either the high or low limit is reached, the assembly blocks and bleeds control pressure to provide failsafe shutdown of the system.