Yokogawa SDAU General Specifications

General

Specications

Model SDAU (Style R) Digital Alarm Unit

GS 01B04K03-02E

 GENERAL

The SDAU Digital Alarm Unit accepts two input signals (freely selectable from 1 to 5 V, mV, thermocouple and RTD), and six detection results in alarm detecting sections are freely connected to AND or to OR. Then they are output to alarm relays (two points, or four points for option).

Each alarm detecting section detects upper limit and lower limit alarms of input absolute value, input rateof-change and 2-input deviation. Either a normally energized or de-energized is selectable for alarm output relays.

The display setter on the front panel can display input values and set/change parameters such as an alarm setpoint. A PC (VJ77) or the JHT200 Handy Terminal can also set/ change parameters.

With the VJ77 Parameter Setting Tool you can do the following:

· Read/write all parameters at once

·Savereadparameterstoale

· Copy parameters to other devices of the same model

andsuxcode.

*1: The BT200 BRAIN Terminal of YOKOGAWA

Electric Corporation can also be connected. The adapter for modular jack (E9786WH) is required for connecting a PC (VJ77) or the JHT200 Handy Terminal or BT200 to the Digital Alarm Unit.

 INPUT/OUTPUT SIGNALS

Input Signals:

DCV Input

Input Signal

DC Voltage Input

Measuring

Range

1 to 5 V DC Input Resistance: 1 MΩ

-50 to 150 mV DC

Input Resistance:1 MΩ

Input External Resistance:

Remarks

500 Ω or less

*1: ITS-90, JIS’95 *2: ASTM E988 Standard: W97Re3-W75Re25

(tungsten97% rhenium3%-tungsten75% rhenium25%)

*3: ASTM E988 Standard: W95Re5-W74Re26

(tungsten95% rhenium5%-tungsten74% rhenium26%)

RTD Input

Input Signal Measuring Range (°C)

JPt100 (JIS’89) -200.0 to 510.0 °C Pt100 (ITS-90, JIS’97) -200.0 to 850.0 °C Pt100 (IPTS-68, JIS’89) -200.0 to 660.0 °C Pt50 (JIS’81) -200.0 to 649.0 °C

Input lead resistance : 10 Ω/lead or less

Number of Input Points

• Two points each 1 to 5 V DC (not

Two points (SDAU-1 type)

Two points (SDAU-2 type)

isolated between inputs mutually) or

• One point 1 to 5 V DC, and one point mV, thermocouple or RTD (isolated between inputs mutually)

Two points each universal inputs (not isolated between inputs mutually) mV, thermocouple or RTD freely selectable

Thermocouple Input

Input Signal

(*1)

Type K

(*1)

Type T

(*1)

Type J

(*1)

Type E

(*1)

Type B

(*1)

Type R

(*1)

Type S

(*1)

Type N Type W3 Type W5

(*2)

(*3)

Measuring Range(°C)

-270.0 to 1372.0

-270.0 to 400.0

-210.0 to 1200.0

-270.0 to 1000.0

100.0 to 1820.0

-50.0 to 1768.0

-270.0 to 1300.0 0 to 2315 0 to 2315

Remarks

Input Resistance:

1 MΩ

Input External Resistance:

500 Ω or less

Output Signals: Relay contact

Contact Capacity

100V AC 2A (Resistive load) 220V AC 0.5A (Resistive load)

30V DC 2A (Resistive load)

125V DC 0.5A (Resistive load)

Contact life expectancy: 600,000 times

GS 01B04K03-02E

7th Edition Jan. 2021

Number of Output Points:

Two sets of transfer contacts Four sets of NC or NO contacts when

Alarm Output

Failure Output

Retransmission Output (Option)

/RLY4 option is selected. Specify normally energized/normally de-

energized by parameter. One set of NC or NO contact

Always normally energized

Not available when /RLY4, /VLT or /CUR

option is selected. One point 1 to 5 V DC or 4 to 20 mA DC

/VLT: 1 to 5 V DC /CUR: 4 to 20 mA DC

Failure output is not available.

Can not be combined with /RLY4

 ALARM FUNCTIONS

Alarm Detecting Sections 3 (each independent)

Input Mode

Alarm Setting Upper and lower limit values, -19999 to 32000 (in engineering units) Hysteresis 0 to 32000 (in engineering units) Rate-of-Change Alarm

Sampling Time Alarm Output Sections

(each independent) Alarm Output Connection Six detection results are freely connected to AND or to OR.

Alarm Timer Mode

Timer Setting

Direction of Relay Action Set normally energized / de-energized.

Contact

Indicator Lamp Yellow lamp (ALMn) lights up on alarm.

Input absolute alarm 2-input deviation alarm Input rate-of-change alarm

1 to 9999 s

2 or 4 when /RLY4 option is selected.

Alarm output (delay) timer

ON/OFF delay timer

Alarm output timer

Alarm ON/OFF delay

(dead time) timer

Two sets of transfer contacts or

Four sets of NC or NO contacts when /RLY4 option is selected.

0 to 600 s (in 1-second increment) However, about a 0.2 second delay is added to the above set time to prevent wrong operation.

0 to 999 s (in 1-second increment)

GS 01B04K03-02E Jan.12, 2021-00

 ALARM FUNCTION BLOCK DIAGRAM

Note 2: Any of six types of HI Alarm / LO Alarm can be connected.

F01.ai

PV1 PV2

Alarm

Detecting

Section

Alarm

Connection/

Output Section

Note 1: Select one of them to use.

Deviation

(PV1-PV2)

(Note 1)

Alarm

Detection 1

HI Alarm LO Alarm

(Note 2)

AND/OR Connection

Alarm timer

Alarm Output 1

Rate-of-

change

PV1

Rate-of-

change

PV2

(Same as Alarm

Detection 1)

Alarm

Detection 2

HI Alarm LO Alarm

/RLY4

only

(Same as

Alarm Output 1)

Alarm Output 2 Alarm Output 3 Alarm Output 4

(Same as

Alarm Output 1)

Detection 1)

Alarm

Detection 3

/RLY4

only

(Same as

GS 01B04K03-02E Jan.12, 2021-00

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