Data Loggers / CR21
RETIRED ›
This product is no longer available and has been replaced by: CR3000. Some accessories, replacement parts, or services may still be available.
Product Details
Typically Ships Within 21 - 28 Days
Restockable Yes
Warranty
Compliance

The "Typically Ships Within" value is an estimate of the number of calendar days within which this product is ready to ship from Campbell Scientific. Orders with more than 10 built-to-order products will likely increase the time needed to prepare the order for shipping.

To estimate how long it will take to receive an order that contains multiple products, combine the longest Ships Within value with the transit time of the shipping method you select.

Some specialized products have long Ships Within values. Because of this, you might consider submitting a separate order for these products so your other products won't be delayed.


Other Accessories

 
The 17166 provides a paper Operator's Manual for 10-second CR21 Microloggers.
 
The 17167 provides a paper Operator's Manual for 1-Minute CR21 Microloggers.

Replacement Parts

425
 
Eight standard Alkaline "D" cells were used in the CR21, and may be purchased as a replacement item.
18860
 
The 18860 is a 12 V, 2.9 Ahr sealed rechargeable battery.
SC32B
 
This optically isolated RS-232 interface is used to connect a PC to the data logger's CS I/O port via an SC12 or SC12R-6 cable.
ENC12/14
 
ENC12/14 Weather-Resistant 12 x 14 inch Enclosure
 
Although, the CR21 loggers were originally housed in 020/021/022/028 Enclosures (now retired), the holes in the CR21 bases are compatible with the ENC12/14 enclosure (fit the holes intended for the 21X).
Enclosure Hole Options - show details
-SC -SC 1 Conduit for Cables
The -SC option provides one 1.5-in diameter conduit on the underside of the enclosure. Multiple cables can be routed through this conduit. The 7363 enclosure supply kit contains a plug that can reduce the conduit's internal diameter to 0.5" and putty for sealing the conduit.
-DC -DC 2 Conduits for Cables
The -DC option provides two 1.5-in diameter conduits on the underside of the enclosure. Multiple cables can be routed through each conduit. The 7363 enclosure supply kit contains plugs that can reduce the conduits' internal diameter to 0.5" and putty for sealing the conduits.
-ES -ES 6 Entry Seals for Cab
Choose the -ES entry seals option for a more water-tight seal than provided by the conduits. With this option, each entry seal is compressed around one cable. A small vent is included to equalize pressure with the atmosphere. The ENC12/14 is fitted with (2) medium, and (4) small cable entry seals. The acceptable cable diameters are:

Medium—0.231" to 0.394" (5.8 to 10 mm)
Small—0.118" to 0.275" (3 to 7 mm)

Additional cable entry seals can be added to the enclosure with the assistance of one of our applications engineers (SPECIAL-AE); consult the factory for details.
-NC -NC No Conduit/Entry Seal
This option is available for customers who wish to spend time in the shop customizing the enclosure with cable entry options of their own design. Experience in working with fiberglass-related products is recommended.
Enclosure Mounts - show details
-NM -NM No Enclosure Mounting
With this option, the enclosure is shipped without brackets. Customers who will bolt their enclosure to a flat surface should choose the -NM option. The no bracket option might also be appropriate for applications in which the enclosure will be set on a table.
-MM -MM Tripod Mast Mounting
Order the "-MM" option if you want to mount your enclosure to the mast of one of our tripods or to a user-supplied pole with a 1.25" to 2.1" OD. A three-piece, stainless-steel bracket attaches to the top of the enclosure and an identical three-piece, stainless-steel bracket attaches to the bottom of the enclosure. Each bracket is attached to the mast or pole via a 2" u-bolt.
-LM -LM CM1xx Leg Mounting
The "-LM" option allows the enclosure to be attached to the leg base of a CM106, CM110, CM115, or CM120 tripod. This option includes a metal flange, two stainless-steel brackets, and a 2.5" u-bolt. The brackets attach to the right and left side of the enclosure, and the flange attaches to the tripod near the mast. The flange fits into a notch in one of the brackets, and the other bracket connects to a tripod leg via the u-bolt.
-TM -TM Tower Mounting
Order the "-TM" option if you want to mount your enclosure to a UT10, UT20, or UT30 tower. This mounting bracket option uses the same 3-piece, stainless-steel brackets as the "-MM" option, except the pieces are rearranged so that the flanges are on the side of the bracket instead of in the middle. Four 1.5" u-bolts attach the brackets to the tower legs.

Please note that enclosures with the "-TM" option are shipped configured for the UT10 tower. UT20 and UT30 customers will need to: (1) remove the bolts attaching the bracket to the enclosure, (2) slide out the flange sections so that the distance between the center of each flange is 17", and (3) reattach the bracket to the enclosure using the original bolts.
-PM -PM Pole Mounting, 4-10in
Choose the "-PM" option to mount the enclosure on a pole with a 4" to 10" OD. This option includes two stainless-steel brackets and two metal bands. One bracket is attached to the top of the enclosure and the other bracket is attached to the bottom of the enclosure. The metal bands are then routed through the brackets and wrapped around the pole. Screw clamps at the end of each band are used to tighten the bands around the pole.
-EM -EM ET Pole Mounting, 3in
Choose the "-EM" option to mount the enclosure on a pole with a 3" OD. This option uses strut clamps and a hangar bracket.