The HDI 2021 Pressure Transmitter is an intrinsically safe, certified, field-repairable 4-20mA transmitter built with high quality components HDI is known for throughout its line of products. The transducer (sensor) is an embedded strain gauge placed in a stainless steel housing. HDI’s Transmitter is unique because of its field repairability. If the pill or internal board are damaged due to use over time, the user is able to order the spare parts necessary to fix the unit quickly onsite, reducing downtime and saving on overall cost. Video tutorials are available to assist in the repair online.

The 2021 Transmitter is commonly housed in a 1502 Hammer Union. However, the customer may specify a variety of housings to suit their application (2” 1502 Hammer Union, 2” 2202 Hammer Union, or a flanged connection). The transmitter is delivered as a complete assembly ready for installation. All HDI Transmitters provide safety, accuracy, reliability, and low maintenance for the user.


  • Field repairable system
  • 6,000 psi, 10,000 psi, 16,000 psi
  • 2” 1502, 2” 2202, or flanged connections
  • 4-20mA output available
  • Solid state platform; no fluids or moving parts


  • 4-20mA output (additional barrier required)


  • CSA: Intrinsically Safe Class 1, Division 1, Groups A, B, C and D
  • ATEX: optional, II 1 G, Ex ia IIC T4

Tech Files:




Pill Replacement (Part 1)

Pill Replacement (Part 2)

HDI M993 Installation


HDI M100 Pressure Gauge System

HDI 1000B Pressure Gauge System

HDI 2000B Pressure Gauge System

HDI 2000P Pressure Gauge System

HDI 2021 Pressure Transmitter System

HDI 2100 Pump Stroke Counter System

HDI 2200 Choke Position Indicator System

HDI 2250 Valve Position Indicator System

HDI 2400 Pressure Gauge System

HDI 3200 Mud Gas Separator Monitoring System

HDI 3300 Temperature Gauge System

HDI 9000 Choke Console System

HDI V9000 Virtual Choke Console System


7240 Brittmoore Rd., Suite # 119,
Houston, TX 77041


P: 713-688-8555
After Hours Telephone: 713-819-6103
Joe Colotta: 713-819-6103
Chris Colotta: 832-458-9346
Joseph Ebenezer: 713-446-2212
F: 713-688-2228