• APG HU-1502 Hammer Union Pressure Transducer
  • Two 1502 HUs are shown connected to pipes that are connected to a mud pump. They shake as they operate. The camera zooms on one HU. Arrows show the pressure of the mud flow.

1502 HU Hammer Union Pressure Transmitter


As Tough As The Roughnecks Who Use It

Everything on an oil & gas drilling rig needs to be tough. Our 1502 hammer union pressure transducer is built for extreme pressure, high vibration, and rough handling.


Certified & Ready
The 1502 HU is certified for global use in hazardous locations through CSA (Class 1, Div 1/Zone 0), ATEX (CE 0344 EX II1G Ex ia IIB T4 Ga), and IECEx (EX ia IIB T4 Ga). It's also NACE MR-01-75 and ISO 15156-3 compliant for sour gasses.

Easy Field Calibration
With the Shunt Cal feature, you can calibrate the transmitter to the right pressure range without having to pressure it up.

Handles Vibration
The welded body and durable electronics handle extreme vibration common in MWD and other high pressure processes.

Smart Design
When we first started the design for the HU, we made sure to pay attention to the details - like a wider top for easy access to the connector, and drain holes to keep it from filling with water.

Common Applications
  • Oil and Gas Drilling
  • Measurement While Drilling
  • Cementing
  • Mud Pumps / Mud Logging
  • Fracturing
  • Acidizing
  • Standpipe
  • Stimulation
  • Well Head Measurement
  • Choke and Kill
  • Coiled Tubing


Pressure Range
Up to 20,000 psi
B.F.S.L. ≤ 0.25% of full scale
NIST up to ± 0.1% available in select ranges
Temperature Compensation Range
Up to -40 to 150° F (-40 to 65° C)
Temperature Effects on Zero & Span
± 0.026% FSO/°C (± 0.01% FSO/°F)
Life Expectancy
10 million cycles minimum
Frequency Response
Less than 5mS


Supply Voltage
10-30 VDC on sensor
Loop Resistance
1124 ohms @ 30 VDC decreasing linearity to 0 ohms @ 10 VDC
Insulation Resistance
>100 megohms @ 500 VAC, 70°C


CSA Intrinsically Safe
Class I, Div. 1, Groups C & D, EX ia IIB T4
Class I, Zone 0, AEx ia IIB T4
ATEX Intrinsically Safe
CE 0344 EX II1G Ex ia IIB T4 Ga (Ta = -40°C to +85°C)
IECEx Intrinsically Safe
EX ia IIB T4 Ga; Ta = -40°C to +85°C


0-5 VDC
Internet Connectivity
with RST-5003 (4-20mA version only)
Output Signal @ 21° C
4-20 mA: 3-30 mA max
0-5 VDC: 110 mA inrush current
0-5 VDC: 3.5 mA operating current


Shunt Cal
100% of Full Scale


Wetted Material
NACE MR-01-75 and ISO 15156-3 compliant Nickel Alloy
316L SS
Fig. 1502


Storage Temperature
-50 to 248° F (-50 to 120° C)
Operating Temperature
-40 to 185° F (-40 to 85° C)
Enclosure Protection


History of APG's HU Hammer Union Pressure Transducer

APG's HU Hammer Union Pressure Transducer Drop Test

APG's American Hammer Union Pressure Transducer