Sentry Industries 5000 사용자 설명서

 

The Analog Input Module is used to allow input to 
Sentry by a 4-20 mA analog device, such as an 
analog gas sensor or other type of sensing device. 

The module has the same physical form as other 
Sentry gas modules except that the sensor 
assembly in the lower hub is replaced by the user’s 
analog input device. 

Figure 8-5 shows the terminal connections for the 
analog input module. 

• 

Connect channel wiring (P S G) from the 
Sentry controller to TB1 in the same manner 
as other sensor modules. 

• 

For three wire analog input device: 

⇒ 

Double up the power (P) on TB1 
connection to provide 19 - 21 VDC to the 
analog input device. 

⇒ 

Connect ground (G) and signal (S) on 
TB2 to the corresponding terminals on the 
analog input device. 

• 

For two wire analog input device: 

⇒ 

Double up the power (P) on TB1 connection to 
provide 19 - 21 VDC to the analog input device. 

⇒ 

Connect signal (S) on TB2 to the corresponding 
terminal on the analog input device. 

Prior to reading voltages and making adjustments perform 
a visual inspection to confirm that there are no physical 
problems such as water in the electronics enclosure, 
wiring damage or corrosion. 

The Model 5100-99 transmitter must be adjusted when a 
new analog input is connected.  It is not necessary to 
perform periodic adjustment of the tranmitter, but normal 
calibration of the input should be perfomred according to 
manufacturer instructions. 

To adjust the tranmitter: 

1.  Connect DVM to Signal Out and Ground test points 

on the cover plate. 

2.  Supply 4 mA from the sensor device and adjust “Zero 

Adj” potentiometer until DVM reads 0.0 VDC. 

3.  Supply 20 mA from the sensor device and adjust 

“Span Adj” potentiometer until DVM reads 2.0 VDC. 

4.  Repeat steps 2 and 3 on an iteration basis until step 2 

requires no further adjustment. 

To calibrate the combined Model 5100-99 and analog 
sensor input, follow the standard Sentry Global 
Calibration instructions.  See 5.3.1.1