Optical encoders scale range
Linear scales
RTL (stainless steel tape)
Scale name | Accuracy | Scale pitch | Coefficient of thermal expansion at 20 °C | Supplied length | Readhead compatibility |
RTLF-S
| 20 μm: ±5 μm/m 40 µm (high accuracy): ±5 µm/m 40 μm: ±15 μm/m | 20 µm/40 µm | 10.1 ±0.2 µm/m/°C | Up to 10 m (> 10 m on request) | ATOM, ATOM DX |
RTLC-S  | 20 μm: ±5 μm/m 40 µm (high accuracy): ±5 µm/m 40 μm: ±15 μm/m | 20 µm/40 µm | 10.1 ±0.2 µm/m/°C | Up to 10 m (> 10 m on request) | |
RTLA-S  | 30 μm: ±5 µm/m | 30 µm/50 µm | 10.1 ±0.2 µm/m/°C | RESOLUTE: up to 21 m EVOLUTE: up to 10.02 m |
RTL FASTRACK™ (stainless steel tape with track option)
Scale name | Accuracy | Scale pitch | Coefficient of thermal expansion at 20 °C | Supplied length | Readhead compatibility |
RTLC with optional FASTRACK  | 20 μm: ±5 μm/m 40 µm (high accuracy): ±5 µm/m | 20 µm/40 µm | 10.1 ±0.2 µm/m/°C | Up to 10 m (> 10 m on request) | |
RTLA with optional FASTRACK  | 30 μm: ±5 µm/m 50 μm: ±10 µm/m | 30 µm/50 µm | 10.1 ±0.2 µm/m/°C | RESOLUTE: up to 21 m EVOLUTE: up to 10.02 m |
RKL (narrow stainless steel tape)
Scale name | Accuracy | Scale pitch | Coefficient of thermal expansion | Supplied length | Readhead compatibility |
RKLC-S, RKLR-S  | 20 μm: ±5 μm/m 40 µm (high accuracy): ±5 µm/m 40 μm: ±15 μm/m | 20 µm/40 µm | Matched to substrate material when scale ends are fixed with end clamps | Up to 20 m (> 20 m on request) | |
RKLF-S  | 20 μm: ±5 μm/m 40 µm (high accuracy): ±5 µm/m 40 μm: ±15 μm/m | 20 µm/40 µm | Matched to substrate material when scale ends are fixed with end clamps | Up to 10 m (> 10 m on request) | ATOM, ATOM DX |
RKLA-S  | ±5 μm/m | 30 µm | Matched to substrate material when scale ends are fixed with end clamps | Up to 21 m | RESOLUTE |
REL (ZeroMet™ spar)
Scale name | Accuracy | Scale pitch | Coefficient of thermal expansion at 20 °C | Supplied length | Readhead compatibility |
RELM20/RELE20  | ±1 µm for up to 1 m, then ±1 µm/m | 20 µm | 0.75 ±0.35 µm/m/°C | Up to 1.5 m | |
RELA30  | ±1 µm for up to 1 m, then ±1 µm/m | 30 µm | 0.75 ±0.35 µm/m/°C | Up to 1.5 m |
RSL (stainless steel spar)
Scale name | Accuracy | Scale pitch | Coefficient of thermal expansion at 20 °C | Supplied length | Readhead compatibility |
RSLM20/RSLE20/RSLC20 | ±1.5 µm up to 1 m, ±2.25 µm up to 2 m, ±3 µm up to 3 m, ±4 µm up to 5 m | 20 µm | 10.1 ±0.2 µm/m/°C | Up to 5 m | |
RSLA30 | ±1.5 µm up to 1 m, ±2.25 µm up to 2 m, ±3 µm up to 3 m, ±4 µm up to 5 m | 30 µm | 10.1 ±0.2 µm/m/°C | Up to 5 m |
Partial arc scales
RKL (narrow stainless steel partial arc tape)
Scale name | Accuracy | Scale pitch | Coefficient of thermal expansion at 20 °C | Supplied length | Readhead compatibility |
RKLC-S  | 20 μm: ±5 μm/m 40 μm: ±15 μm/m | 20 µm/40 µm | 10.1 ±0.2 μm/m/°C | Up to 20 m (> 20 m on request) | |
RKLF-S  | ±15 μm/m | 40 µm | 10.1 ±0.2 μm/m/°C | Up to 10 m (> 10 m on request) | ATOM, ATOM DX |
RKLA-S  | ±5 μm/m | 30 µm | 10.1 ±0.2 μm/m/°C | Up to 21 m | RESOLUTE |
Rotary scales
RES (stainless steel ring)
Scale name | Typical installed accuracy* (depending on ring diameter) | Scale pitch | Coefficient of thermal expansion at 20 ºC | Ring diameter | Readhead compatibility |
RESM  | (300 mm diameter) ±3.1 arc second | 20 µm/40 µm | 15.5 ±0.5 µm/m/°C | 52 mm to 550 mm | |
RESA30  | (300 mm diameter) ±3.1 arc second | 30 µm | 15.5 ±0.5 µm/m/°C | 52 mm to 550 mm |
* 'Typical' installations are a result of graduation and installation errors combining and, to some magnitude, cancelling.
REX (ultra-high accuracy stainless steel ring)
Scale name | Typical installed accuracy* (depending on ring diameter) | Scale pitch | Coefficient of thermal expansion at 20 ºC | Ring diameter | Readhead compatibility |
REXM20/REXT20  | (≥ 100 mm diameter) ±1 arc second | 20 µm | 15.5 ±0.5 µm/m/°C | 52 mm to 417 mm | |
REXA30  | (≥ 100 mm diameter) ±1 arc second | 30 µm | 15.5 ±0.5 µm/m/°C | 52 mm to 417 mm |
* 'Typical' installations are a result of graduation and installation errors combining and, to some magnitude, cancelling.
RCDM (glass disc)
Scale name | Scale pitch | Coefficient of thermal expansion at 20 ºC | Disc outer diameter | Readhead compatibility |
RCDM  | 20 µm/40 µm | ~8 µm/m/°C | 17 mm to 108 mm |
CENTRUM™ (stainless steel disc)
Scale name | Scale pitch | Coefficient of thermal expansion at 20 ºC | Disc outer diameter | Readhead compatibility |
CSF40  | 40 µm | 15.5 ±0.5 µm/m/°C | Fixing options: Bolts: 38.4 mm to 120 mm Clamp: 31 mm to 120 mm For other sizes, contact Renishaw |