At Sigma HLR Controls, we and our family of distributors provide specialty valves, pilots, relays and sensors able to operate in the most extreme conditions. Our control devices are manufactured for use in low temperature arctic service and high temperature industrial applications. Of note also, is that HLR Controls has the capabilities of manufacturing in exotic materials used for highly corrosive environments.
We lead the way in providing the most reliable products in the field of safety system controls. Over the past five decades, our line of safety and control products have set the industry standard for dependable pneumatic and hydraulic instruments.
Originally designed for offshore applications the primary body material used on most of our devices is 316 SST. As mentioned above other
The model 7970 pressure switch/stick pilot is our flagship products having sold tens of thousands of units. It is most impressive in its ability to repeatedly retain any setpoint from 10psig to 10,000psig without requiring field personnel to order additional parts and pieces. The 7970’s minimal reset deadband, high reliability and repeatability continues to make it stand out far ahead of any competitors.
Jump to page 11 here for piston change over instructions for the 7970 pressure switch/stick pilot.
On the market today there are jobbers and knock offs of our highly successful flagship product, the 7970 pressure switch or stick pilot. They tend to have several issues including enlarged deadband, internal seal failures and lack of repeatability. Don’t trust your staff, equipment and processes to substandard safety and control devices, get the best, get the original 7970 from HLR Controls.
Serving the oil and gas industry worldwide, we offer proven products, quick delivery and the highest level of customer service. Call or email Peterson Instruments (the HLR Canadian and international distributor) today for more information, or a quote. Your satisfaction is our priority. If you are located in the US please click here to find your local distributor.
Model 7970 Pressure Sensor
The model 7970 pressure sensor is a heavy duty pneumatic or hydraulically controlled switch that can sense pressures ranging from 10 to 10,000 psig - in 1 switch, no extra parts or different springs are needed. This is accomplished by dividing the sensing pressure field into four ranges via a brilliantly designed variable area sensing piston.
Four piston configuration ranges:
Changing the piston arrangement is accomplished by simple re-arrangement of the piston parts installed, plus those found in the onboard parts tube located in the center of the sensing spring.
All this and a deadband of only 3-4% of setpoint and industry leading economics of ownership.
Dimensions: 1.750” Dia. X 8.000” L.
Working Pressure: Sensed Inlet - 10 - 10,000 PSIMax.
Process Connections: 1/2”-14 MNPT & 1/8”-27 FNPT
Control Connections: 1/4”-18 FNPT
Weight: 3.5 lbs.
Panel Mount Detail: 1 5/8” diameter hole required.
A. Instrument Supply pressure 30-125 PSI Pneumatic or Hydraulic.
B. Extra parts for changing piston arrangements are stored in tube in adjusting cap.
Other 7970 Series Models available:
7970-20M - 2,000-20,000 PSI Adjustment Range with 9/16 Medium Pressure Conn
7970-20H - 2,000-20,000 PSI Adjustment Range with 9/16 High Pressure Conn
7970T - Teflon “wetted” O-rings, NACE Certified
7970LP - Low Pressure, 2-50 PSI adjustment range
7970H-A - Offset instrument controls ports for 3/8 tubing
7970SS - All stainless steel (316SS)
7970DSS - Duplex stainless steel “wetted” parts
For piston re-configuring and re-ranging instructions watch the video linked above.
HLR 5000 High/Low/Relay Assembly
HLR Controls has taken a 7970 Pressure Sensor set (PSHL)(The PSHL is the automatic reset hi and low set), and an HLR 150-14FM Manual Reset Relay (MRR) and tubed it up in a typical single well hook-up configuration to allow for sensing and tripping of both hi and low pressure setpoints with start-up bypass and with monitoring of control circuit pressure all encased in a full 316SST package.
HLR Start-Up Bypass Hi/Lo Shutdown
The economical Single well safety system with a manual bypass of low pressure switch for start-up. Once a safe minimum operating pressure is met then the low sewtpoint bypass clears to allow all shutdowns to activate on trip, of either hi or low pressure.