What are the differences between the HI 2151/20WC and the HI 2151/30WC?

DIFFERENCES BETWEEN THE HI 2151/20WC AND THE HI 2151/30WC:

INTEGRATED TECHNICIAN - The HI 2151/30WC has built-in diagnostics called Integrated Technician (IT). This is a method of on-line and off-line weighing system diagnostics. The on-line diagnostics capability continuously monitors the weighing system to detect failures such as opened or shorted load cells or cables. The off-line diagnostic capability is used to troubleshoot the weighing system allowing the reading of each load cells millivolt, millivolt per volt resistance and weight,. When used with the HI 215IT-xxx series summing box, problems can be isolated to individual load cells, interconnection cables or within the weight controller.  Most of the HI 2151/20WC units did not have this feature; however, the later units had this available.

AUTO ZERO TOLERANCE - Some of the HI 2151/20WC's had this feature, some did not. All of the HI 2151/30WC's have this feature. The Zero Tolerance (O TOL) is a manual zero feature. The Auto Zero Tolerance (AO TOL) is an automatic zero feature.

SERIAL PORT - In the HI 2151/20WC Hardy Link, RS232, and RS422/485 were available options. These features are standard on the HI 2151/30WC. The 2151/30WC does not have RS232 current loop or Modbus commuications capabilities.

DIGITAL DISPLAY - The HI 2151/30WC digital display uses six 14 segment LED's (versus 7 segment in the HI 2151/20WC) for improved readability.

BAR GRAPH - The Bar graph feature is standard on the HI 2151/30WC. This analog 30 segment display is used simultaneous with the digital weight display.  This was an option on the HI 2151/20WC.

EXCITATION VOLTAGE - The excitation voltage of the HI 2151/30WC is 0 to +5 volts DC. The HI 2151/30WC with advanced circuitry and WAVERSAVER can obtain more stable weight readings using 5 volt excitation than most instruments do with 10 or 15 volt excitation.  The HI 2151/20/WC used -5 to +5 (10 v differencial).

CONNECTORS - The HI 2151/30WC now uses the larger standard plug in (5mm) connectors to make optimum use of rear panel space and increase serviceability.

SECURE MEMORY MODULE - The Secure Memory Module (SMM) is moved from inside the HI 2151/20WC to the rear panel of the HI 2151/30WC for easy access. The new SMM has increased memory capability and stores all the instrument parameters allowing easy transfer of the data to a replacement instrument if ever needed. The 2151/20WC has a SMM with built-in battery and the 2151/30WC has a SMM that does not have a built in battery.

MODBUS COMMUNICATIONS - The 2151/20WC had a Modbus communication option, the 2151/30WC does not have Modbus communicaton capabilities. If you wish to have Modbus communication options, Hardy has several other model units with this option.

SOFTWARE SELECTABLE WAVERSAVER - Rather than have to move an internal physical jumper to select vibration rejection frequency levels (WAVERSAVER), on the HI 2151/30WC you can now push front panel keys or program them over a network.

FACTORY MUTUAL SAFETY BARRIERS ARE DIFFERENT - If you are converting from the obsolete HI 2151/20WX controller to the HI 215/30WC or HI 2110WI controller, the Intrinsic safety barriers are different and will need to be changed. The HI 2151/20WC had a excitation voltage of 10vdc that was a combination of +5 and - 5 vdc. The new weight controllers all have a 0 to +5 vdc excitation and that excitation voltage will not work with the HI 2151/20WC barriers. You will see very unstable weight readings using the old barriers and may not actually be intrinsically safe.