3 3/4 Digit Meter with Isolated BCD Output

3 3/4 DIGIT METER WITH ISOLATED BCD OUTPUT
MODEL 267B-RTD

1/8 DIN (1A) Case

Connections Diagram

STANDARD FEATURES

100 platinum RTD input

sensor excitation

0.1°C or 0.01°C resolution

120 dB CMR up to 500

V Bright, 0.56 in (14.2 mm) LED display

Parallel BCD output

Screw-terminal barrier strip

1/8 DIN case

Isolated, parallel BCD output

OPTIONS

Buffered, isolated, gated and stored BCD

IEEE-488 (GPIB) interface

0.25 mV/count linearized analog output

HI or LO alarm setpoint

5 V dc, 9-32 V dc or 26-56 V dc power

NEMA-4 splash-proof lens cover

Bench-style case with 1 or 12 inputs

Model 267B-RTD is a high-resolution, high-accuracy 3 3/4 digit (200 to +7,800-count) RTD meter with a wide range of output options. It is available in three standard configurations for 100- platinum RTD's with alpha of 0.00385 or 0.003925. Resolution is 0.1°C or 0.01°C. The analog input is optically isolated from the digital circuitry. This eliminates possible problems associated with ground loops or common mode voltage and effectively isolates all output signals from the analog input.

BCD-OUTPUT STANDARD
Parallel BCD output is a standard feature of the 267B and is implemented on the main circuit board. It is good for about 2 ft, and can be used to interface the 267B to a comparator (Model 872A) and a printer (Model 820A). It is isolated by the optical isolation of the meter input. Additional data and control outputs can be provided by an optional upper board.

OUTPUT OPTIONS
Upper-board options of the 267B include five different BCD output boards, an IEEE-488 (GPIB) communications interface, a 0.25 mV/count analog output, and a single-setpoint controller with reed-relay output.

PANEL-MOUNT OR BENCH-STYLE CASE
The standard case of the 267B is 1/8 DIN-sized and is designed for panel mounting. A splash-proof lens cover is optional. The 267B can also be mounted in a bench-style case, which is available for one RTD input or with a rotary switch for 12 inputs. For additional information, please refer to the Options and Mechanical sections.

SPECIFICATIONS

ANALOG INPUT
Sensor type: 100 platinum RTD
Overvoltage protection: 6 Vp
Current excitation, nominal: 0.25 mA (PC1 and PC2),0.78 mA (PC3)
Max lead resistance: 10 per conductor (add ±0.005% of reading/ to overall error)
Zero tempco (bridge-network error): ±0.02 deg/deg
Span tempco: ±0.006% of reading/°C

NOISE REJECTION
NMR: 60 dB, 50/60 Hz
CMR: 120 dB, DC to 60 Hz
CMV: 500 Vp

TEMPERATURE RANGE/CALIBRATION	CONFORMITY ERROR	ACCURACY ±1/2 count	Resolution	MODEL #
-200.0 to +780.0°C DIN 43760 / Alpha 0.00385	±0.05°C	±0.44°C	±0.1°C	267B-PC1
-200.0 to +630.0°C IPTS-68 / Alpha 0.003925	±0.05°C	±0.35°C	±0.1°C	267B-PC2
-20.00 to +78.00°C DIN 43760 / Alpha 0.00385	±0.005°C	±0.044°C	±0.01°C	267B-PC3

ANALOG-TO-DIGITAL CONVERSION
Input configuration: Bridge
Technique: Dual-slope, average-value, ratiometric
Polarity: Automatic
Signal integration period: 100 ms
Read rate: 3 to 4/s

DISPLAY
Type: 7-segment, red LED
Height: 0.56 in (14.2 mm)
Symbols: 788.8
Overrange indication: Three least-significant digits blank
Leading-zero blanking: Automatic

DIGITAL SIGNALS
Input signals: TTL and 5 V CMOS compatible
Output signals: TTL-compatible

POWER
AC voltages:120 or 240 V ac, ±15%
AC frequency: 50/60 Hz
Power consumption: 5 W
DC voltages: 5 V dc ±5%, non-isolated; 9-32 V dc, isolated to 300 Vp; 26-56 V dc, isolated to 300 Vp
DC power consumption: 4 W at 5 V dc, 6 W at 9-32 V dc

ENVIRONMENTAL
Operating temperature: 0 to 50°C
Storage temperature: 40 to +75°C
Relative humidity: 95% at 40°C (non-condensing)

MECHANICAL
Panel-Mount Case
Dimensions: NEWPORT DIN1A (1/8 DIN case) (see Mechanical section for drawings)
Weight: 19 oz (540 g)
Case material: 94V-0 UL-rated polycarbonate
Bench-Mount Case
Dimensions (W x D x H): 8.5 x 8.8 x 3.0 in (21.6 x 22.1 x 7.6 cm) (see Mechanical section for drawings)
Weight (including 267B): 3.5 lbs (1.60 kg)
Case material: Metal enclosure