Rice Lake Intrinsically Safe - Manual (Page 8)

2 320IS Installation Manual
1.1 Overview
The
320IS
is a single-channel digital weight indicator designed and approved to operate as an intrinsically safe
system in a wide variety of scale and weighing applications. The indicator is housed in a NEMA 4X/IP66-rated
stainless steel sealed case. The standard unit is equipped with a tilt stand base for tabletop or wall mounting
applications. The indicator front panel consists of a large (0.8 in, 20 mm, 16-segment), six-digit LED display,
6-button keypad and eight LED annunciators. Features include:
• Drives up to four 350 or eight 700 load cells
• Supports four-wire and six-wire load cell connections (six-wire remote sense recommended)
• Full-duplex fiber optic interface to attach an external I/O board located in the safe area
The
320IS
is NTEP-certified and pending Measurement Canada approval for Classes I, II and III at 10,000
divisions. See Section 8.9 on page 65 for detailed specifications.
Available with optional I/O Module (PN 72721):
• Four configurable digital inputs
• Four digitally-controlled single pole single throw-normally open non-latching relay contact outputs
• Electronic data processing (EDP) port communications at up to 38400 bps for full duplex RS-232/RS-422/
RS-485 and Current loop
• Printer port communications at up to 38400 bps for full duplex RS-232/RS-422/RS-485 and Current loop
• Two 16-bit analog output channels provide ±10V or ±5V, 0-5V or 0-10V, and 4-20 mA tracking of gross
or net weight values
1.2 Factory Mutual Approval
The 320IS is Factory Mutual (FM) Entity approved for:
• Classes I, II, and III
• Divisions 1 and 2
• Groups A, B, C, D, E, F and G
• T-rating T4
Only devices that have FM Entity Approval with proper entity parameters may be used unless specifically listed in
this manual or control drawing PN 72717 as part of the Rice Lake Factory Mutual systems approval. Failure to
comply with this voids the FM approval.
The classification of hazardous materials are different in the US and European standards. Because of this, the
safety class of the
320IS
is declared in the following regulations:
• US standards: Class I, II, III, DIV1, Groups A-G. 
Substitution of components may impair intrinsic safety.
To prevent ignition of flammable or combustible atmospheres, disconnect power before servicing.
1.3 Operating Modes
The 320IS has three modes of operation.
Normal (Primary) Mode
Normal mode is the “default” mode of the indicator. The indicator displays gross or net weights as indicated by
LED annunciators (see Figure 1-1) to indicate scale status and the type of weight value displayed.
Setup Mode
Most of the procedures described in this manual require the indicator to be in setup mode including configuration
and calibration.
To enter setup mode, remove the large fillister head screw from the enclosure backplate. Insert a non-metal
screwdriver or a similar tool into the access hole and press the setup switch once. The indicator display changes to
show the word
CONFIG
.
Test Mode
Test mode provides a number of diagnostic functions for the 320IS indicator. Like setup mode, test mode is entered
using the setup switch (Section 7.8 on page 55).
WARNING