Sentinel Business Machines Warranty Support Most Sentinel products include a three year warranty. If you're experiencing problems with your Sentinel product, or simply have questions, please fill out the below form for assistance. You should receive a response within 1 to 2 business days. Your Contact Information: Full Name: Phone Number: Email Address: Product Information: Product: Sentinel SB-1200 Bill Counter Product Serial Number: Describe Your Problem/ Question: Please enter the following code into the box provided: