User Manual

PT2E-1140

８．Spesifications

８−１ Specifications

Type ：ＳＤ−７０５ＥＣ

Detection principle ： Electrochemical Cell method

Gas to be detected ： Toxic gas

Detection method ： Diffusion type

Detection range ： Depends on gas

Response time ：Ｔ60…６0 sec or less

Transmission method ：３-wire type analog transmission(power, signal, common)

Transmission distance ： 1.25 km or less with CVVS(1.25 sq.) cable

2km or less with CVVS (2.0 sq.)cable

Alarm output

： 2 level alarm output

・Contact output:1a or 1b

・Contact rating:DC30V 1A

Preset alarm point ： Depend on gas and range

External output ： 4-20mA(current discharge type), Resistive load : max 300Ω

0.5mA‥‥‥‥ at fault

2.5mA‥‥‥‥ in the maintenance mode and during initial

operation

4-20mA‥‥‥ Gas concentration output

Note : Linear up to 22mA.

Indication function ： Concentration indication : LCD 4digits, 7-segment,

Digital gas concentration indication,4-20mA indication

PW/TR‥‥ Power/Trouble indication(Green/flickering or

Lighting)

AL1 ‥‥1st alarm indication(Yellow/flickering or lighting)

AL2 ‥‥2nd alarm indication(Red/flickering or lighting)

SKIP ‥‥Maintenance mode indication(Green/flickering or

lighting)

ZERO‥‥Zero adjust mode(Red/flickering or lighting),

etc.(off)

SPAN‥‥Span adjust. mode(Red/flickering or lighting),

Etc.(off)

mA‥‥‥ mA indication(Green/lighting),ets.(off)

Self-diagnosis function ： Abnormality of zero correction.

Indication : PW/TR(Green/flickering).LCD message “E-XX”.

Output : 4-20mA output→0.5mA output(fix)

Initial clear ： 25 seconds after power ON（LCD indication“−

−

−”）