background image

HOBO® Micro Station (H21-002) Quick Start 

17595-A MAN-H21-002-QSG 

Setting up the Logger 

1.

 

Insert the four AA alkaline or lithium batteries and place 
the battery strap on the batteries. 

 

2.

 

With a crescent wrench, remove the dome nut from the 
stuffing gland in the sensor port. 

 

3.

 

Push the slit insert out from the inside of case. You may 
need to push the slit insert out using a pen (capped end), 
pencil (eraser end), or other blunt instrument.  

4.

 

Some sensors have an anti-snag device on the connector 
as shown below. If any of your sensors has this device, 
check that the connector fits through the stuffing gland. 

 

If the connector does not fit through the stuffing gland, 
you will need to trim the anti-snag device with a knife so 
that the connector looks like the one below. 

 

5.

 

Insert the sensor connectors through the dome nut. The 
threaded side of the dome nut should be facing towards 
the connector. Then, slide the cables through the stuffing 
gland and through the hole in the case. Push the cables 
into the slit insert.  

Note:

 The electronics on some older temperature sensors 

are housed in a tube that is close to the sensor connector. 
If you have any of these sensors, be sure to insert them 
first because they will need more room inside the logger. 
Adjust the sensor as needed so that the tube with the 
electronics fits inside the logger without too much 
unnecessary bending of the cable. 

 

6.

 

Plug the sensors into the logger. Adjust the cable length as 
necessary so there isn’t excess cable inside the case.  

7.

 

If you are using fewer than four sensors, add the o-ring 
cord(s) to plug the empty hole(s) in the slit insert. 

8.

 

Apply some silicone grease to the slits on the insert. 

9.

 

Push the slit insert back into the stuffing gland. Pushing 
the slit insert in at a slight angle and with a slight twist may 
help it slide in more smoothly. 

10.

 

Screw the dome nut onto the stuffing gland, tighten by 
hand, and then an additional ½ to ¾ turn with an 
adjustable wrench. The dome nut must be snug, but 
shouldn’t be overtightened. 

11.

 

From the back side of the stuffing gland, fill the void inside 
with silicone grease from the package. 

12.

 

Remove the desiccant pack from its foil pouch and place 
inside the logger enclosure to minimize internal 
condensation. 

13.

 

Apply silicone grease to the outside rim of the case where 
the cover meets up with the housing. The grease should be 
applied sparingly in this location. 

14.

 

Screw the clear cover back onto the case. Use a Phillips-
head screwdriver to tighten the four cover screws. 

 

 

Anti-snag device on some 
external sensor connectors 

Anti-snag device 
removed from the 
external sensor 
connector 

Dome nut 

Stuffing gland on sensor port

Dome nut

Slit insert

Sensor cable and 
connector 

Stuffing gland on sensor port

Stuffing gland 
slit insert 

Battery strap

O-ring cord to fill 
empty holes 

Reviews: