PFS E Series Explosion Proof Pulse Input Flow Rate Totalizer

The PFS E Series Explosion-Proof Pulse Input Flow Rate Totalizer provides local flow indication in hazardous areas. It connects with turbine meters and other flowmeters that generate pulse or frequency signals.

The explosion-proof flow totalizer displays flow rate, resettable total, and accumulated total. Selected models also provide flowmeter linearization, flow alarms, historical totals, or compensated gas volume calculations.

Operators can configure the monitor through the glass using three optical keys. Model-dependent PC, USB, Modbus, or HART options also support configuration and system integration. Configurable pulse and 4-20 mA outputs can transmit flow data to other control equipment.

The E Series features a rugged aluminum or stainless steel 316L enclosure. It also supports battery, external DC, and loop-powered configurations. These options allow engineers to match the monitor to the flowmeter, installation, and available power.

Westech Industrial supplies the PFS E Series throughout Canada. Our team can help select the appropriate model, enclosure, input, output, and power configuration. Westech can also integrate the monitor into custom-fabricated panels, skids, shelters, and complete instrumentation systems.

PFS E Series Explosion Proof Pulse Input Flow Rate Totalizer

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Description

Explosion Proof Construction for Hazardous Areas

The PFS E Series explosion proof pulse input flow rate totalizer provides rate and total indication where hazardous-area protection remains essential. Its enclosure supports certified gas and dust applications under ATEX, IECEx, FM, and CSA classifications.

Available protection ratings include IP66 or IP67, depending on the model. North American configurations also carry Type 4X, Type 7, and Type 9 ratings. Therefore, the enclosure protects the electronics against demanding industrial and environmental conditions.

Customers can select a coated die-cast aluminum enclosure for general industrial service. A stainless steel 316L enclosure provides another option for offshore and corrosive environments.

Broad Pulse Input Compatibility

The explosion proof flow totalizer accepts many pulse and frequency signals. Compatible inputs include passive and active pulse, NAMUR, NPN, PNP, reed switch, and coil signals.

The selectable coil input supports standard sensitivity levels. Optional higher-sensitivity inputs accommodate lower-level coil signals. In addition, the input includes configurable filtering for improved signal stability.

The monitor accepts frequencies up to 10 kHz. However, the maximum frequency depends on the input signal and selected low-pass filter. This flexibility allows the E Series to work with turbine meters and many other frequency-generating devices.

Clear Flow Rate and Total Display

A high-intensity, UV-resistant LCD provides clear local process indication. The display includes seven 12 mm digits and eleven 7 mm digits. Symbols and engineering units provide additional operating information.

Operators can view flow rate, resettable total, and non-resettable accumulated total. The display also includes flow trend arrows and status messages. A 20-segment speedometer shows the current flow rate from zero to 100 percent.

The display updates according to the selected refresh rate. After a keypress, it refreshes eight times per second for 30 seconds before returning to the configured setting.

The bright backlight improves viewing in sunlight and low-light conditions. External power allows adjustable and continuous backlighting. With battery power, a keypad touch activates the backlight briefly to conserve battery life.

Through-the-Glass Configuration

Three optical keys let operators access settings without removing the explosion-proof cover. This design simplifies routine operation and helps preserve enclosure integrity.

Operators can program the K-factor, engineering units, decimal positions, input selection, display function, and output scaling. Password protection can restrict access to configuration settings.

The monitor stores settings in EEPROM memory. As a result, a power interruption or depleted battery does not erase the configuration. Running totals receive regular backup for dependable data retention.

Depending on the selected model and communication option, technicians can also configure the unit through PC software, USB, Modbus, or HART communication.

Model-Specific Measurement Functions

The E110-P provides straightforward flow rate, total, and accumulated total indication. It suits applications that need dependable pulse input monitoring without flow curve correction.

The E112-P adds flowmeter linearization. This function corrects the flowmeter curve before displaying or transmitting linearized flow rate and total values.

The E018-P combines linearization with configurable flow alarms and model-dependent alarm or pulse outputs. It also offers HART communication for configuration and process monitoring.

The E126-P-EG calculates compensated gas volume or mass flow. It accepts pressure and temperature inputs for corrected gas measurement. It can also display current, previous, and historical daily totals.

Flexible Outputs, Communications, and Power

Configurable pulse outputs transmit a scaled quantity based on totalized flow. Selected models can also retransmit the incoming frequency as a square-wave output. Maximum scaled pulse frequency reaches 500 Hz on supported outputs.

A galvanically isolated 4-20 mA output transmits the measured flow rate. Engineers can scale this output to the required process range.

Communication options vary by model. The E110-P, E112-P, and E126-P-EG support model-dependent Modbus RS232, RS485, and USB options. The E018-P offers HART communication.

Power choices include a long-life lithium battery, external 9-27 VDC power, and loop-powered configurations. Battery life can reach approximately three years. However, settings, outputs, backlight use, and sensor requirements affect service life.

Applications

The PFS E Series supports hazardous-area flow monitoring across liquid and gas measurement systems. The available models address simple totalization, linearization, alarm monitoring, and compensated gas measurement.

  • Turbine flowmeter rate and total indication
  • Pulse and frequency-generating flowmeters
  • Hazardous-area liquid flow monitoring
  • Hazardous-area gas flow monitoring
  • Applications requiring flowmeter curve linearization
  • High-flow and low-flow alarm monitoring
  • Corrected gas volume measurement
  • Remote flow transmission using pulse or 4-20 mA signals
  • Modbus-connected monitoring and control systems
  • HART-enabled flow monitoring
  • Wall-mounted and pipe-mounted installations
  • Offshore and corrosive industrial environments

Documents

PFS_E Series Explosion Proof Pulse Input Flow Rate Totalizer E018-P_Manual_July2026_Westech.pdf

PFS_E Series Explosion Proof Pulse Input Flow Rate Totalizer E110-P_Manual_July2026_Westech.pdf

PFS_E Series Explosion Proof Pulse Input Flow Rate Totalizer E112-P_Manual_July2026_Westech.pdf

PFS_E Series Explosion Proof Pulse Input Flow Rate Totalizer E126-P-EG_Manual_July2026_Westech.pdf

Manufacturer info

Primary Flow Signal designs and manufactures flow measurement solutions for liquid, gas, and steam applications. Its product offering includes Venturi flow meters, wedge-type meters, orifice flow elements, flow nozzles, and custom-engineered differential pressure measurement products for industries such as water and wastewater, oil and gas, power generation, industrial processing, automotive, and cryogenic service.

SPECS

Product Type:
Explosion-proof pulse input flow rate indicator and totalizer.
Available Models:
E110-P, E112-P, E018-P, and E126-P-EG.
E110-P Function:
Displays flow rate, resettable total, and accumulated total.
E112-P Function:
Displays linearized flow rate, resettable total, and accumulated total.
E018-P Function:
Provides linearization, flow alarms, totalization, and optional HART communication.
E126-P-EG Function:
Calculates compensated gas volume or mass flow using pressure and temperature inputs.
Flowmeter Input:
Coil or sine wave, NPN, PNP, reed switch, NAMUR, and active pulse signals.
Input Frequency:
0 Hz to 10 kHz; actual maximum depends on signal type and filtering.
K-Factor:
0.000010 to 9,999,999 with variable decimal position.
Display Type:
High-intensity numeric and alphanumeric UV-resistant LCD with bright backlight.
Dimensions:
Ø 65 x 45 mm (2.56 x 1.77 inches).
Display Digits:
Seven 12 mm (0.47") digits and eleven 7 mm (0.28") digits.
Display Refresh Rate:
User definable: fast, 1 sec, 3 secs, 15 secs, 30 secs, or off. Display values normally update at the selected rate. Pressing any key switches the display to eight updates per second. After 30 seconds of key inactivity, the display returns to the configured refresh rate.
Speedometer:
20-segment bar graph from zero to 100 percent in five-percent increments.
Total:
Seven digits with zero to three decimal places; operator reset available.
Accumulated Total:
Eleven digits; non-resettable.
Flow Rate Time Units:
Per second, minute, hour, or day.
Flow Units:
mL, L, m³, mg, g, kg, ton, US ton, US gal, imperial gal, oil bbl, lb, cf, rev, scf, Nm³, nL, or no unit, depending on the model and configuration.
Digital Outputs:
Model-dependent scaled pulse, incoming pulse retransmission, alarm, transistor, or relay outputs.
Maximum Scaled Pulse Frequency:
Up to 500 Hz on supported outputs.
Analog Output:
Model-dependent configurable, isolated 4–20 mA output representing flow rate; output range can be scaled or tuned.
Communications:
Model-dependent Modbus RS232, Modbus RS485, USB, remote PC configuration, or HART.
Remote Control:
Optional external total reset or clear-lock input.
Battery Power:
Long-life lithium battery with up to approximately three years of operation, depending on configuration.
External Power:
Model-dependent 9-27 VDC.
Loop Power:
Model-dependent 11-27 VDC through the analog output.
Sensor Excitation:
Low-power excitation for coil and reed inputs; externally powered configurations can provide 8.2, 12, or 24 VDC sensor supply.
Enclosure Materials:
Coated die-cast aluminum or stainless steel 316L.
Enclosure Dimensions:
112 x 133 x 148 mm (4.41 x 5.24 x 5.83 inches).
Enclosure Ratings:
IP66 or IP67, depending on model; Type 4X, Type 7, and Type 9.
Operating Temperature:
Generally -40°C to +70°C (-40°F to +158°F); the E126 stainless steel enclosure has a +67°C maximum.
ATEX Gas Classification:
II 2 G Ex d or Ex db IIC T6 Gb, depending on model certification.
ATEX Dust Classification:
II 2 D Ex tb IIIC T85°C Db.
IECEx Gas Classification:
Ex d IIC T6 Gb.
IECEx Dust Classification:
Ex tb IIIC T85°C Db.
FM and CSA Classification:
Class I, Division 1, Groups A, B, C, and D; Class II/III, Division 1, Groups E, F, and G.
Zone Classification:
Class I, Zone 1, AEx d IIC T6 Gb; Zone 21, AEx tb IIIC T85°C Db.
Availability:
Canada Wide.

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PRODUCT FAQ's

What does the PFS E Series display?
The E Series displays flow rate, resettable total, and non-resettable accumulated total. The screen also shows engineering units, operating status, flow trends, and alarm information. Selected models provide additional information. The E018-P can show flow alarm conditions. The E126-P-EG can show pressure, temperature, and historical daily totals.
Which flowmeter signals can the E Series accept?
The pulse input models accept passive and active pulse, NAMUR, coil, NPN, PNP, and reed-switch signals. This compatibility supports turbine meters and other frequency-generating flowmeters. Available input options vary by model and ordered configuration.
What is the difference between the E110-P and E112-P?
The E110-P provides standard rate and total indication. The E112-P adds flowmeter curve linearization. Linearization helps correct a known non-linear flowmeter response. Therefore, the E112-P can display and transmit corrected flow rate and total values.
When should I select the E018-P?
Select the E018-P when the application requires linearization, flow alarms, or HART communication. It supports configurable low, low-low, high, and high-high flow alarm functions. Its outputs can provide alarm status, scaled pulse transmission, or frequency retransmission. The exact functions depend on the ordered configuration.
What does the E126-P-EG measure?
The E126-P-EG measures compensated gas volume or mass flow. It combines the pulse flowmeter signal with pressure and temperature measurements. The model supports PT100 temperature input or a 4-20 mA temperature input. It also accepts a current-based pressure input. The display can show corrected flow, totals, pressure, and temperature.
Can operators configure the monitor without opening the enclosure?
Yes. Three optical keys provide through-the-glass operation. Operators can review and change permitted settings without removing the explosion-proof cover. Model-dependent communication options also support configuration through PC software, USB, Modbus, or HART.
Can the E Series operate on battery power?
Yes. Selected configurations use a long-life lithium battery. Battery life can reach approximately three years, depending on the settings and connected equipment. Battery power only activates the backlight briefly after keypad operation. It also cannot power certain relay outputs or higher-power sensors.
Can Westech help select and integrate the correct model?
Yes. Westech Industrial can help determine the required model, input, output, enclosure, power supply, and communication options. Westech also provides technical service and integration support throughout Canada. Our Custom Fabrication team can incorporate the monitor into panels, skids, shelters, and complete instrumentation packages.