Bag-Sealer™ Probe

LogTag TREX-8 with BagSealerProbeThe Bag-Sealer™  Probe is designed for use with a LogTag TREX-8 temperature recorder. The probe prevents leakage while measuring the internal temperature of a blood bag.

The Bag-Sealer Probe was developed by William Laboratories specifically for insertion through a blood bag port without letting bag fluid leak out during validation. The probe has a 1.5 meter (5 ft.) cable length.  The probes and temperature recorders are calibrated as matched set.

During the development of the Val-A-Sure™  Cooler Validation Kit, we identified the need for a temperature probe that could be inserted into a blood bag. It was crucial that the probe we supplied with the Validation Kit not permit liquid to leak from a blood bag, whether it was a glycerol-water mix or a blood product.

Manufacturer-supplied probes, with the temperature recorders we tested, were all found to be inadequate in one of several ways:

  1. the probe came with a sharpened tip for piercing a surface that easily (and quite readily) punctured the side of a blood bag after it was inserted through a bag port;
  2. the probe was too thin and did not provide a complete seal around it after insertion into a blood bag, with the result that liquid to leaked from blood bags;
  3. the larger diameter probes were very difficult to insert into a blood bag.

Click to view temperature recorder data graphs.

Given that our test users wanted both non-probe and probe temperature recorders, we needed to come up with a probe that:

  • could be inserted into a blood bag without piercing a side wall after insertion through a bag port
  • could be fairly easily inserted
  • would not permit leakage of bag fluid around the probe

We solved the customer requirements by designing a custom probe and providing glycerol lubricant to permit relatively easy insertion into a blood bag, while also acting as a seal around the probe.

Regulations require annual calibration of temperature-measuring devices.

For temperature recorder and Probe recalibration information, click here.