HI 2151/30WC Single-Scale Controller

HI 2151/30WC is a  general purpose weight controllerused for a wide variety of process weighing applications including batching, blending, check weighing, filling/dispensing, force measurement, level by weight and weight rate monitoring.

HI 2151/30WC Weight Controller

General Purpose Weight Controller

The HI 2151/30WC is used for a wide variety of process weighing applications including batching, blending, check weighing, filling/dispensing, force measurement, level by weight and weight rate monitoring.

Notice for Non-RoHS Compliant Construction

As a stand-alone product, the HI 2151/30WC can control as many as eight set point relays, (2 standard form C) and transmit data via analog, serial, Allen-Bradley RIO, Profibus DP or BCD communications. Data is displayed alpha-numerically on the six digit fourteen segment LED display and graphically on the 30 segment bar graph display. Weight values can be based on either Net, Gross, Rate-of-Change (ROC), Peak Hold or Totalized weight values in pounds or kilograms.

The weight controller can also be used as a front end for a manufacturing control system, transmitting weight values via a standard operator selectable serial port (RS-232, RS-422/485) and interface with programmable logic controllers (PLCs), computers, and printers. Also available are optional Allen Bradley Remote I/O, Analog and Profibus interfaces for communication to programmable logic controllers.

A 20-bit analog to digital converter in the weight controller updates twenty (20) times per second and is capable of 985,000 counts of display resolution. This gives the instrument the ability to tolerate large “dead” loads, over sizing of load cells/sensors and still have sufficient resolution to provide accurate weight measurement and control. Commands can be entered into the instrument from the communication ports or locally from the front panel keypad. A portion of the keys can be locked out to limit operator access and protect data.

Hardy’s process weighing solutions are easy-to-install, configure, commission and operate. They are easy-to-maintain and save you time, money, raw materials and/or finished product. Visit our case studies or application notes  to learn more. 



HI 2151/30WC   
Panel mount unit
HI 2151/30WC-RM   
Remote mount unit. Display can mount up to 5 feet from the instrument body.
HI 2151/30WC-BR 
 Blind remote mount. Keyboard/display is not included.
HI 2151/30WC-WS   
Wall mount unit. NEMA 4X stainless steel

Serial Output
-A1  RS 232 (full duplex) Default
-A2  RS 422 (full duplex)
-A3  RS 485 (half duplex)

Input Device Option
Standard input power is 120 VAC + / - 10 percent.
Output Device Option
Analog Output (-B1)

The Analog Output is configured from the front panel or the serial port and set up by jumpers on the printed circuit card. The option allows the transmission of Gross, Net, Optional ROC, Peak or Total weight as 0-5V, 0-10V, 0-20mA or 4-20mA (or the reverse of these), and makes it possible to span these ranges over a portion of the weight data. Resolution is 16,000 counts, or the number of display counts available in the range selected, whichever is less.
Two analog optional boards can be installed in each instrument. Both voltage and current data are available simultaneously.

Binary Coded Decimal (BCD) Output (-B2)
This BCD Option provides six digits of parallel weight data representing Net, Gross, Tare and the present front panel display. If all types of output data are requested, they will appear one after the other, ten milliseconds apart. The BCD option provides a 37 pin D-subminiature connector on a 6 inch cable.

Binary Coded Decimal (BCD) Output (-B5)
This BCD option provides six digits of parallel weight data representing Net, Gross, Tare and The Present Front Panel Display. If all types of output data are requested, they will appear one after the other, ten milliseconds apart. The BCD option provides a 40 pin connector on a 60 inch cable for use with either the optional - B6 or -B7 external termination boards.

BCD Single Termination Card (-B6)
The BCD Single Termination Card is an optional external interface point for a single BCD port signal line. The card is designed for use with a single HI-2151/30WC-B5 instrument.

BCD Quad Termination Card (-B7)
The BCD Quad Termination Card is an optional external interface point for up to four sets of BCD port signal lines. All terminal positions accept 20 to 26 gauge cable sizes. Additional terminal boards may be interconnected to allow multiple BCD ports to exist in a tri-state arrangement.

Remote I/O (RIO) Interface to the Allen-Bradley Network (-B8)
The RIO port allows bi-directional communications with Allen-Bradley Programmable Logic Controllers (PLC) and Small Logic Controllers (SLC). The HI 2151/30WC represents a quarter rack of discrete I/O (32 bits in the Logic Controllers output and input image files) to the Logic Controller and supports both discrete and block transfers of data. It can support up to 230.4 Kbaud transfer rates.

Binary Coded Decimal (BCD) Output (-B9)
This option provides six digits of parallel weight data representing Net, Gross, Tare and the present front panel display. If all types of output data are requested, they will appear, one after the other, ten milliseconds apart. This option provides a 24 inch cable for use with the HI 2151/30WC-WS wall mount controller.

PROFIBUS Interface Option (-B12)

Allows bi-directional communications to Profibus (Process Fieldbus) products including those made by Siemens, GE Fanuc and Texas Instruments. This interface supports PROFIBUS-DP (Decentralized Periphery) and processes both Selectable Predetermined and Block transfer commands. It supports up to 12 Mbaud transfer rates.

Dynamic Data Exchange (DDE) (-B14)
Allows bi-directional communications with a PC over the serial port using Windows® 3.x, Windows® 95, Windows® NT. The DDE links the HI 2151 series weight controllers to a Windows® based application software such as: Wonderware®, Visual Basic, Excel®, Lotus 1-2-3, or Quattro Pro®.
Control Options

Peak Hold (-C1)
Displays and stores the highest Gross weight value measured until cleared by the front panel Key pad or from a remote command. This option is generally used in testing to determine peak forces a product or material can withstand. It can also be used to track the highest force applied to the scale.

Rate-of-Change (ROC) (-C2)
The ROC option measures and displays the rate at which a material enters or is dispensed from the scale over a period of time. To develop ROC data, a register is used that is 21 entries in length. New weight values are inputted to the register at the rate of 1/20th of the time base. The first register is subtracted from the 21st Register. The 21st register is one time base older than the 1st register. The time frame can be set to units per second, minute or hour. A time base of discrete values is selectable from 1 to 1800.
Set Point Options

TTL(Transistor - Transistor Logic) Level Output (-D1)
Provides six TTL level outputs, rated at 500 milliamps per line. A mating connector with eight 24 gauge un-terminated wires, 60 inches long is also provide.

External Setpoint Relays Card (-D2)
This externally mounted card is equipped with six solid state triac relays. Individual relays can be configured as form A or form B by an on board dip switch. Each can be programmed to respond to the standard Net or Gross modes of operation or the optional ROC, Totalizer or peak hold modes. Each have individual setpoint, preact and deadband parameters. A 60 inch interface cable is provided. This option should not be used with the wall mount enclosure.

External Setpoint Relays Card (-D3)
The same as the -D2 option except that the length of the cable provided is six inches. This is designed to mounted in the HI 2151/30WC-WS-D3 wall mount enclosure.

NIST/NTEP Certification Mode Kit (-E3 except for -F4 wall mount)
The HI 21251/30WC is approved for National Institute of Standards and Technology (NIST) applications formally called the National Bureau of Standards (NBS), and certified under the National Type Evaluation Program (NTEP) for up to 10,000 counts when the NIST mode is activated. This option is required when products are to be directly sold based on weight readings of the scale. This kit includes special screws for sealing the instrument, a label plate, a NEMA 4 gasket and a NIST label.

Portable Display and Keypad (-E4)
The HI 2151/30XX-E4 option is used for local set-up, calibration and display of the blind remote version instrument, model HI 2151/30WC-BR.

Intrinsic Barrier Assembly (-F1, -F3 thru -F7)
The Intrinsic Barrier Assembly Option is used only with the wall mount Model HI 2151/30WC-WS. The option provides safety for Class I, II and III, Division I applications.


• Alpha-numeric: 6 digit, 14 segment red LED
• Bar Graph: 30 segment LED
Update Rate
• 20 times per second
• Sliding up to 200 readings in single unit increments
• Display: 1:985,000 (3mV/V load cells)
• Internal: 1:1,048,000
• 0.0015% non-linearity
Stable Weight Reading
• WAVERSAVER® 0.25Hz minimum
Calibration Techniques
• C2® electronic calibration
• Traditional calibration with test weights
•Soft Calibration with manual input of load cell data
• Two internal Form C relays
• Setpoint (target weight)
• Preact (trip point)
• Deadband (reset)
• 115 VAC, 3 amp, Form C
Data Security
• Secure Memory Module (SMM)
Built In Diagnostics
Load Point Excitation
• 5 VDC internal power supply to drive up to eight 350-ohm load cells
Standard Networking Options
• RS 232: Full duplex (-A1)
• EIA 422: Full duplex (-A2)
• EIA 485: Half duplex (-A3)
• Hardy Link LAN
Common Mode Rejection
• 100 dB at 50-60 Hz
Power Requirement
• 120/240 VAC, ±10 %, 47-63Hz
• 10 watts with options installed
Operating Temperature
• -10° to +50°C (14° to 122°F)
• 0-90% non-condensing
• 8 remote functions
• NTEP, Canada Weights & Measures
• Hazardous Area FM Class I, II, III Div. 2 Groups A-G
• UL
• Two-year warranty against defects in workmanship

All specifications subject to change without notice. Please contact the Hardy factory or visit our website for the latest specifications.

Hardy Process ToolboxHardy Process Toolbox

The Hardy Process Toolbox is a set of productivity tools that support industrial weighing functions. Each tool saves time, increases accuracy, improves efficiency or reduces risk in process weighing applications, including WAVERSAVER® to eliminate vibration, C2® electronic calibration and Integrated Technician® to name just a few.

The HI 2151/30WC features the following Toolbox technologies:

WAVERSAVER® Vibration Eliminator
Hardy's WAVERSAVER core technology eliminates the effects that surrounding vibration has on the scale weight signal, providing only true data for fast, accurate weight reading.

C2® (or eCAL) Electronic Calibration
The Hardy C2® (or eCAL as it is known in China) core feature provides quick and easy electronic calibration of a weighing system without the need for heavy test weights.

Hardy's INTEGRATED TECHNICIAN (IT) core feature helps you troubleshoot your weighing system and diagnose problems from the front of the instrument or via the PLC. These tests display system weights, voltages, and pass/fail displays to help isolate a problem to the instrument, cabling, or sensors, helping to reduce maintenance costs.

Secure Memory Module Stores Configuration Data
For the HI 2151/30WC, Hardy's Secure Memory Module  is a proprietary card used to automatically back up critical weighing system data, and allowing you to transfer it to another like controller in a few minutes.