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TM

INSTALLATION GUIDE

H809

OPERATION

The H809 is a current-sensitive switching device that monitors current (amperage) 
in the conductor passing through it. A change in amperage in the monitored 
conducter that crosses the switch threshold plus the hysteresis value will cause the 
resistance of the status output to change state, similar to the action of a mechanical 
switch. The setpoint is adjustable through the action of a 20-turn potentiometer 
(see CALIBRATION section). The status output is suitable for connection to building 
controllers or other appropriate data acquisition equipment operating at up to 120 
volts. The H809 requires no external power supply to generate its output.

TROUBLESHOOTING

Problem

Solution

No Reading at 

Controller

• Check sensor calibration (see above)
• Check for control power at sensor (<120 VDC)
• Check for amperage in monitored conductor (>0.75 A)
• Verify correct polarity

Setpoint screw has 

no stops

• The setpoint screw has a slip-clutch at both ends of its travel to 

avoid damage. Twenty turns CCW will reset the sensor to be most 

sensitive. Repeat calibration above.

Both LEDs are lit

Unit is out of calibration. Turn screw 20 turns CCW and recalibrate.

DANGER: 5A CTs can present hazardous voltages. 

Install CTs in accordance with manufacturer's instructions. 

Terminate the CT secondary before applying current.

H68xx-5A CT

150A

300A:

5A 

 2.5A

> 50 A (Sensor max.)

CAUTION 

RISK OF EQUIPMENT DAMAGE

•  Derate the product’s maximum current for the number of turns 

through the sensing window using the following formula.

Rated Max. Amps ÷ Number of Turns = Max. monitored Amps
e.g. :  100A ÷ 4 Turns = 25 Amps max. in monitored conductor

•  Failure to follow these instructions can result in overheating 

and permanent equipment damage.

A. To monitor under-current (belt loss, coupling shear, status)

A

OK!

!

1. Turn setpoint screw 
clockwise until Status 
Open LED turns ON.

2. Slowly turn the screw counter-clockwise until the Status Closed LED just 
turns ON.

3. Turn the screw an 
additional 1/4 turn 
counter-clockwise for 
operational margin.

B.  To monitor over-current (mechanical problems, seized impeller)

3. Turn the setpoint 
screw an additional 
1/4 turn clockwise for 
operational margin.

1. Turn setpoint screw 
counter-clockwise until 
Status Closed LED turns ON.

2. Slowly turn the setpoint screw clockwise until the Status Open LED just 
turns ON.

OK!

STATUS

A

OK!

!

OK!

STATUS

1/4

Setpoint

+

+

1/4

Setpoint

Before beginning calibration, establish normal load conditions.

OK!

A

OK!

Then choose either A or B below.

< 0.75 A (Sensor Min.)

0.5A

4x

CALIBRATION

Setpoint

Status

Open

STOP

Setpoint

Status

Closed

STOP

Setpoint

Status

Closed

STOP

Setpoint

Status

Open

STOP

NOTES

For load currents greater than sensor maximum rating:

 

Use a 5 Amp (H68xx series) Current Transformer (CT) as shown. This technique can be 
combined with wrapping (see below) to add range for a low current load on a high 
current source.

For load currents less than sensor minimum rating:

 

Wrap the monitored conductor through the center window and around the sensor 
body to produce multiple turns. This increases the current measured by the 
transducer.

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