RKI Instruments SD-705EC - Manual (Page 35)

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“− − − −”）
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