Edgetech Instruments SENTRY Application Note

APPLICATION NOTE

2016_03-02 SENTRY Rev 2

Edgetech Instruments Inc.

An ISO 9001 Certified Company

399 River Road . Hudson . MA . 01749

Main: [phone] . Fax:[phone]

www.edgetechinstruments.com

Using the SENTRY Compressed Gas Alarm System

The SENTRY is designed to detect low pressure or high dew point condions within compressed air or inert
gas systems. It consists of a display control module and a SMART, Mul-Sense Probe. Using the supplied ½
inch Male NPT pipe ng, the probe is inserted directly within the compressed air system header,
accumulator tank, or at the point of use. The SENTRY system connuously monitors both pressure and dew
point and provides a warning system to alert an operator should there be a pressure loss or dryer failure.

There are two models available:

SENTRY 85: strobe light and 85dB Audible Alarms SENTRY 100: strobe light and 100dB Audible Alarms

SENTRY-85

Compressed Air Monitor

Dew Point -10C
Pressure: 120 PSIG

SENTRY-100

Compressed Air Monitor

Dew Point -10C
Pressure: 120 PSIG

Alarm
Disable
Switch

Mute
Switch

HPP125 Sensor ProbeHPP125 Sensor Probe

3m Power Cord

1 m Signal Cable

3m Power Cord

1 m Signal Cable

IMPROVE reliability of compressed air/ dryer systems

REDUCE maintenance expenses by idenfying problems before they happen

ELIMINATE corrosion, product loss or process damage because of high moisture

The SENTRY offers many standard features including:

 Plug n’ Play Operation: typical options are standard
 HPP125 Multi-Sense Smart Probe: Pressure and Calculated Dew Point
 Arrives with NIST Traceable Calibration Certificate
 Smart sensor tip is easily replaced- no need to send in for calibration
 Smart Sensor tip comes with NIST traceable certificate, replace – Plug n’ Play
 Simulated Strobe Lamp / Audible Alarm for low pressure or high dew point condition
 Universal VAC Power Supply with 3 meter length power cord
 1 meter length signal cable with quick connection to the Smart Probe
 Local Digital Display of Pressure, Dew Point, and Temperature
 Two 4-20mA Analog Outputs: Pressure and Dew Point & RS-232 Serial Interface
 One User Accessible alarm relay for low pressure/ high dew point

Edgetech Instruments Inc.

An ISO 9001 Certified Company

399 River Road . Hudson . MA . 01749

Main: [phone] . Fax:[phone] . www.edgetechinstruments.com

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Benefits

 Detect Dryer Failures
 Detect Compressor failures or system leaks
 Protect downstream processes and pneumatic equipment
 Ensure Protection at the source or at point of use
 No wait for annual calibration- just replace the smart sensor tip

Notes/ Sampling Configuration Options

1. The HPP125 Probe comes standard with a 1/2inch NPT male ng. This can be inserted directly into the

pressurized gas stream or it may be used in conjuncon with the CAM sample extracon unit.

2. The CAM sample extracon unit provides a sample valve that allows isolaon of the HPP125 probe from the

pressurized process for sensor p replacement or maintenance.

3. There are no atude restricons for sensor probe or display control module mounng.

4. Maximum power requirements for the SENTRY system are less than 0.5 AMP at 110 VAC.

5. The SENTRY 85 features an alarm disable switch that will mute the horn and disable the strobe lamp.

6. The SENTRY 100 features a mute switch that will mute the horn. The strobe lamp will remain acve.

7. The Sentry may be located at mulple points along the path of the pressurized gas stream to be monitored. This

may be useful to sense upset condions at point of use to prevent sensive process or equipment failures.

8. Remote monitoring of the SENTRY condion is available through the 4-20mA analog output signals provided for

both pressure and dew point.

9. Although no alarm condion is triggered, the SENTRY also monitors and displays the sample gas temperature.

10. The SENTRY arrives factory set but you can adjust the set points in the eld using a serial interface.

How to order the Sentry System

1. Determine the alarm set points for Dew Point and Pressure.

2. Determine if you want the Dew Point Units in C° or F°

3. Determine if you want the Pressure Units in PSIG or BAR.

4. Determine the preferred method of mounting the HPP125 sensor probe.

5. List as separate line items additional choices such as CAM, Accessories and Spare Parts.

SENTRY85- - -

Pressure Setpoint Dew Point Setpoint

SENTRY100- - -

Pressure Setpoint Dew Point Setpoint

For Example: SENTRY85-75PSIG – 10F would be a Sentry 85 unit with a low pressure alarm

set to 75 psig and the high dew point alarm set to +10°F.