SMC sierra monitor corporation

Sentry Instruction Manual - Version 6

8.8APPENDIX H - MODEL 5100-99 ANALOG INPUT MODULE

8.8.1 DESCRIPTION

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.

8.8.2 INSTALLATION

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:

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

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

Figure 8-5

Model 5100-99 Analog Input Component Locator

·For two wire analog input device:

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

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

8.8.3 ADJUSTMENT PROCEDURE

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.

8.8.3.1 SIGNAL ADJUSTMENT

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.

8.8.3.2 CALIBRATION

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

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.

APPENDIX H - MODEL 5100-99 ANALOG INPUT MODULE

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Sentry Industries 5000 Model 5100-99 Analog Input Component Locator, Appendix H Model 5100-99 Analog Input Module

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