Yokogawa SC25F User Manual

Page 9

IM 12B6J1-41E-E

2.6 Transmission signal (Data + and Data -)
General

: Bi-directional digital communication (RS 485) with limited

MODBUS support

Data rate

: 9600 b/s (8,E,1)

Output function

: pH or temperature compensated pH

Temperature

Junction resistance

Sensor details (Model, Serial Number, production date)

Sensor calibration data (zero, slope, temperature offset)

Sensor status signals (e.g. Glass impedance detection)

Note: The output functions and settings of the sensor are accessible using a dedicated

device such as the Yokogawa FLXA analyzer.

2.7 Power supply (Supply+ versus Supply Gnd)
Operating range

: +2.7 to +3.6 VDC

Power consumption

≤ 20 mW

Pin #

Signal description

Data -

Data +

Supply +

Shield

Supply Gnd

2.8 Regulatory standards
CE

: Decision 768/2008/EC

- ATEX

: Directive 94/9/EC, as amended by Regulation (EC) no. 1882/2003

Certificate no.

: DEKRA 11ATEX0064 X for

II 1 G Ex ia IIC T3...T6 Ga

Electrical data

: For sensor input circuits (by connector) connected to a certified

intrinsically safe circuit with the following maximum values

Ui = 6.1 V; Ii = 230 mA; Pi = 1.2 W; Li = 4 µH; Ci = 30 µF

or Certified intrinsically safe Yokogawa transmitter Model FLXA21.

Special conditions (X) : T6 for Tamb. -40 °C to +60 °C

T5 for Tamb. -40 °C to +75 °C
T4 for Tamb. -40 °C to +110 °C
T3 for Tamb. -40 °C to +125 °C
Electrostatic charges on the sensor enclosure shall be avoided.

- Pressure

: Directive 97/23/EC, as amended by Regulation (EC) no. 1882/2003

Applying article

: 3.3 (Sound Engineering Practice)

Damaging the screw thread of the sensor might influence the
maximum process pressure.

- EMC

: Directive 2004/108/EC

IEC 61326-1: 2005 Class A (control and laboratory use)
IEC 61326-1: 2005 (use in industrial locations)

- Low Voltage

: Directive 2006/95/EC

Sensor contains glass parts which if broken can cause cutting injuries.

- WEEE

: Directive 2012/19/EU

- RoHS

: Directive 2011/65/EU

IECEx

Applying standards

: IEC 60079-0: 2007; IEC 60079-11: 2006; IEC 60079-26: 2006

Certificate no.

: IECEx DEK 11.0065X for Ex ia IIC T3...T6 Ga

Fig 1: Sensor connector (front view)

with gold plated contacts