• Span: 0.3" W.C. … 6" W.C. to 60 … 6000 PSIG
  • Static Pressure: Max. 4500 PSIG
  • tmax: 248  °F
  • Process Connection: ½" NPT, ¼" NPT, or Various Diaphragm Seals Available upon Request
  • Material: Stainless Steel
  • Various Outputs: 4 ... 20 mA or Frequency Output
  • Sensor Inputs: Differential, Gauge, or Absolute Pressure
  • Digital Communication with HART® Protocol


Differential Pressure Transmitter model PAD is a microprocessor based high performance transmitter. It has flexible pressure calibration and output, automatic compensation of ambient temperature and process variables, configuration of various parameters, and communication with HART® protocol. It measures pressure, flow and level by an application method. All data is input, modified and stored in EEPROM. Pressure Transmitter is also available as a flow meter. The flowmeter model PAD-F has an added totalizing function. It is able to check the flow rate and the totalizing flow. It measures the flow rate by using differential pressure without compensation for the temperature and static pressure. The shape of the PAD-F is the same as the standard device. Only the terminal block is different, since there are two more terminals for the display of the pulse output.

Transmitter Description

Electronics module

The Electronics module consists of a circuit board sealed in an enclosure. There is an MCU module. an analog module, an LCD module and a terminal module within the transmitter. The MCU module acquires the digital value from the analog module and applies correction coefficients selected from EEPROM. The output section of the MCU module converts the digital signal to a 4…20 mA output. The MCU module communicates with the HART®-based communicator or control system such as DCS. The power section of the MCU module has a DC-to-DC power conversion circuit and an input/output isolation circuit. The LCD module plugs into the MCU module and displays the digital output in a userconfigured unit.



Superior Performance

  • High Reference Accuracy
  • Long-term Stability (0.125 % URL for 3 Years)
  • High Rangeability (100:1) for Range 4-0


  • Data Configuration with HART® Communicator
  • Zero Point Adjustment


  • Continuous Self-diagnostic Function
  • Automatic Ambient Temperature Compensation
  • EEPROM Write Protection
  • Fail-mode Process Function
  • CE EMC Conformity Standards (EN 50081-2, EN 50082-2)


Technical Details

Measuring Principle: Capacitance Sensor (PAD-D, -F, -G, -H), Piezo-resistive (PAD-A)
Measuring Span: 0.3" W.C..6" W.C. to 60…6,000 PSIG bar (Depending on Instrument Version) Zero and Span Values can be set anywhere within the Range Limits. Span must be Greater than or Equal to the Minimum Span.
Range 2:
±0.25 % of Span for 0.1 URL ≤ Span ≤ URL ±[0.24 + (0.008 x (URL/Span)) % of Span for 0.05 URL ≤ Span ≤0.1 URL
Range 3: ±0.075 % of Span for 0.1 URL ≤ Span ≤ URL ±[0.25 + (0.005 x (URL/span))] % of Span for 0.02 URL ≤ Span ≤0.1 URL
Range 4 to 0: ±0.075 % of Span for 0.1 URL ≤ Span ≤ URL ±[0.025+(0.005x(URL/Span))] % of Span for 0.01 URL ≤ Span ≤0.1 URL
Turndown Ratio: Ranges 4 ~ 0 = 100 : 1, Range 3 = 50 : 1, Range 2 = 20 : 1
Process Temp.: -40…248 °F (Approval Codes may Affect Limits. Max. Ambient Temperature at LCD = 176 °F.)
Ambient Temp.: -22…176 °F
Ambient Temp.
Effect: ± (0.019% URL = 0.125% Span)/28 °C
Storage Temp.: -40…185 °F (Non-condensing)
Humidity Limit: 5 %...100 % RH
Pressure Limits (with Silicone Oil)
(Valid for stand-alone instruments only without assembled
diaphragm seals.)
Model D and G: 0…1999.6 PSIG (for Range 2...8)
Model G: 0…5800 PSIG (for Range 9), 0...10875 PSIG (for Range 0)
Model H: 0…4495 PSIG (for Range 4...7)
Model A: 0…72.5 PSIG (for Range 4), 0…435 PSIG (for Range 5), 0…754 PSIG (for Range 6)
Burst Pressure
Model D, G and H: 9990.5 PSIG, 11600 PSIG (for Model G, Range 0)
Model A: 145 PSIG (for Range 4), 580 PSIG (for Range 5), 1015 PSIG (for Range 6)
Wetted Materials
Isolating Diaphragms: 316L SS
Drain/Vent Valves: 316 SS
Flanges/Adapters: 316 SS
O-ring: FKM, PTFE as an Option

Non-Wetted Materials
Fill Fluid: Silicone Oil
Bolts: Stainless Steel
Housing: Aluminum or SS, Flameproof (Ex d) and Waterproof (lP67)
Cover O-ring: NBR
Paint: Epoxy-polyester or Polyurethane
Mounting Bracket: For 2-inch Pipe, 304 SS, with 304 SS U-bolt
Nameplate: 304 SS
Connections: ¼" NPT with 54.0 mm Center Distance for Standard Flanges, ½" NPT with Process Adapter (Option)
Mount Position: Upright (Process Connection more Flexible by using Multi-planar Flange)
Display: 5 Digit LCD
Power Supply: 12…45 VDC, 17.5…45 VDC -HART® Communication
Maximum Load: 250 Ω at 17.5 VDC, 550 Ω at 24 VDC, Max. Loop Resistance =

Loop Load: 0...1500 Ω - Operation, 250...550 Ω - HART® Communication
Failure Mode: Fail High: Current ≥ 21.1 mA, Fail Low: Current ≤ 3.78 mA
Connection: ½" NPT Conduit with M4 Screw Terminals (G½ Option)

  • Two Wire 4…20 mA, Configurable for Linear or Square Root Output, Digital Process Value Superimposed on 4…20 mA Signal, Available to any Host that Conforms to the HART® Protocol
  • Frequency Output for Flowmeter Model PAD-F with Pulse Width of 10, 50 or 100 ms (Selectable, Negative Going Pulse) Output Type: Open Collector, 30 V, 500 mA max. Pulse Rate: 49 pulses/sec max. 

Turn-On Time: 3 seconds 

Protection: IP 67 for Standard (Code S) 

Weight: 8.6 lb (Excluding Options) Standard 11.8 lb (SS Housing - Excl. Options) 

ATEX Approval (Option):II 2G Exd IIC T6 ... T5 (see PAS Datasheet)


Order Details: Oval Flange Adapter ZUB-PAD-OVF
Technical Details
Material: 316 Stainless Steel
Seal: PTFE
Bolts: 2 x Mounting Screws 7/16"-20 UNF
Connection: ½" NPT Female