Rinstrum -  R300 Series Digital Indicator Quick Start Manual Rev 1.5 
Page 5 
 
3. Specifications 
 
Performance   
Resolution  
Up to 30,000 divisions, minimum of 0.25µV/division, 20 
updates/second  (Trade 4000 divisions at 0.8µV/division) 
Zero Cancellation  ±2.0mV/V  
Span Adjustment  0.1mV/V to 3.0mV/V full scale 
Stability/Drift 
Zero: < 0.1µV/°C (+ 8ppm of deadload max) 
Span < 8 ppm/°C, Linearity < 20ppm, Noise < 0.2µVp-p  
Excitation  5 volts for up to 4 x 350 or 8 x 700 ohm load cells (4-wire or 6-
wire plus shield)   
Maximum total load cell resistance: 1,000 ohms 
A/D Type  24bit Sigma Delta with 8,388,608 internal counts 
A/D Conversion 
Rate 
20Hz with FIR filtering > 80dB 
Operating 
Environment 
Temperature: –10 to +50°C ambient 
Humidity: <90% non-condensing 
Storage: –20 to +50°C ambient 
R310 and R320: IP55 when panel mounted,  R321: IP65 
Case Materials  R310 and R320: ABS, Silicon Rubber, Nylon, Acrylic (no 
halogen used) 
Packing Weights  Basic Indicator - R310 and R320: 0.34kg,  R321: 2.4kg 
Digital   
Display  LED Backlit LCD with six 20mm high digits with units and 
annunciators 
Setup and 
Calibration 
Full digital with visual prompting in plain messages 
Digital Filter  Sliding window average from 0.1 to 4.0 seconds 
Zero Range  Adjustable from ±2% to ±20% of full capacity 
Power Input   
Standard Power 
Input 
12 to 24VDC (2.5 VA max) - ON/OFF key with memory feature 
Variants  AC  AC Plug pack:  110/240VAC 50/60Hz in 12VDC 0.5A out 
  Battery  4 x AA batteries (Alkaline or rechargeable NiMH, NiCad, etc.) 
Features   
rin-LINK Data 
Coupling 
Infra-red Connector for optional rin-LINK PC cable (to RS-232 
PC port) 
Five point linearity correction 
RS-232 automatic transmit, network or printer outputs.  
Transmission rate: 2400, 4800 or 9600 baud 
Assignable function key: Unit switching, counting, manual hold, 
peak hold, live weight and totalising 
2 isolated transistor drive outputs (300mA total at 50VDC) 
R320 Extra 
Features 
Battery backed clock calendar (Battery life 10 years minimum) 
R321 Features  Equivalent to an R320 with IP65 stainless steel housing.