HACCP-compliant Temperature Documentation and Monitoring in a Refrigerated Warehouse

According to the HACCP approach and in line with legal requirements, continuous tem-perature recording is required for refrigerated storage of food and pharmaceutical products. GesySense is a wireless temperature monitoring system that performs this task while being easy to install and virtually maintenance free.

Local conditions

The description below relates to a food wholesaler’s cold storage warehouse with six cold storage rooms. The temperature of the rooms is between 4 °C and 5 °C. The walls are normal masonry, one room has metal walls. The external dimensions are approx. 45 x 50 [m].

Assignment

• Continuous recording of the room temperatures in the cold storage rooms, the goods receiving area and the platform
• Recording of all measurements on the opera-tional computer
• Failsafe reliability of the recording
• Display of the current temperatures
• Monitoring of the temperatures with regard to adjustable limit values and warning limits
• Alarming the responsible person if the temper-ature approaches or exceeds any of the limitsRealisierung

Realization

Measurement and wireless transmission

GesySense wireless sensor modules

6 Thermo-Sensors
2 PT1000 sensors, temperature measuremen behind the metal wall and 60 cm thick masonry.
3 repeaters, stabilization of the wireless connection

Measurement and recording

GesySense Receiver LAN,

• Wireless reception of the measurements
• Buffering and forwarding to a Delta 2000 data server via TCP/IP
• Display of the current readings and temperature profiles on a local website

Processing

Delta 2000 GesySense

• Recording and evaluation of the data with re-gard to the warning and threshold values as well as the parameters for operation of the wireless network
• Generation of differentiated email messages when warning levels and thresholds are reached
• Display of the current values on a local website
• Archiving of the measured data

Alarm distribution

E-mail – SMS gateway provided by mobilant with situation-dependent distribution lists

User information and system management

Windows PC with LogIt

• Recording and visualization of the data with warning and threshold values
• Status information about the operation of the wireless network
• Tamper-proof archiving
• Print-out of temperature logs
• Administration of the wireless network, message e-mails and configuration of wireless modules

Installation

Installation was performed with an electrician, a refrigeration specialist and the operator’s IT man-ager. A Gesytec employee was involved in an ad-visory capacity. The installation of the devices took 1 day, including commissioning of the system.