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Pilots for Control Systems
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| HLU Universal High-Low Pilot Highlights |
Meets all pressure ranges
Single assembly with storage for unused
parts
Easy field conversion to choice of four
available options
Cost effective ability to modify eliminates
need to rebuy
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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.
| Pilot Models |
| Service |
SDA |
SDE |
SDEP |
Standard, H2S, and CO2 |
876-32 |
876-41 |
876-45 |
Arctic |
876-33 |
876-42 |
876-46 |
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:
- Single or dual porting
- Facility manual reset
- Indicating pressure gauges
- Adjustable setting dials
- Pressure sensing ranges
- Extreme corrosive applications
- Various mounting options
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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
Maximum Supply Pressure |
125 PSI (8.5 bar) |
Operating Temperature |
-20° to 450°F (-29° to 232°C) |
Production Test Pressure |
1.5 x working pressure |
Repeatability of Set Point |
1% of set pressure max. |
Hysteresis or Dead Band |
10% of full range max. |
Material |
NACE MR-01-75 standards* |
Maximum working pressure: |
5 to 115 PSI
|
1,500 PSI |
115 to 10,000 PSI
|
10,000 PSI |
*Charpy impact value exceeds 15 lb. at 75°F (6°C) |
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.
HL-2 Pressure Ranges |
Part Number |
PSI |
433741 |
5-50 |
433742 |
30-115 |
433744 |
100-1,000 |
433743 |
1,000-5,000 |
433745 |
500-1,500 |
433746 |
1,500-3,500 |
433730 |
3,000-6,000 |
433747 |
5,000-10,000 |
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