digital panel meters user guide DPM8901 Temperature Meter features CE approved and marked o o C or F LED display indicator E, J, K, R, T type thermocouple input Accuracy 1 or 0.1 degrees. 4 digit BCD set upper limit alarm On-Off control alarm output relay Alarm output LED indicator and manual reset The DPM8901 is a high accuracy and versatile mains powered temperature meter. This microprocessor based design provides many benefits over the earlier model 8900 which it replaces. Resolution for some thermocouple types can be selected as OPERATING SPECIFICATION o o either 1 C or 0.1 C via a DIP switch. Similarly, E, J, K, R and T Line voltage 115/230 V +10%, -20% thermocouples can be set with DIP switches. Utilisation of a Line frequency 50/60 Hz precision cold junction compensation I.C. allows accurate measurement over the ambient operating temperature range of Accuracy +/- 1% of f.s.d +/- 1 digit the meter. Temperature coefficient 100 PPM/C Additional features include thermocouple error linearisation and Operating temperature 2 to 45C a one point upper limit alarm setting with relay output . The meter is housed in a standard 1/8 DIN size case. Storage temperature -10 to 60C Over range and thermocouple disconnected is indicated by-- -- Humidity below 85% RH -- - in the display. Power consumption 3.5 VA This digital meter can be easily set up by the user to cover most applications using the following instructions . CMRR 80dB Hysteresis 3 or 0.3C (depends on resolution) Relay life 1,000,000 operations STEP BY STEP INSTRUCTIONS Remove instrument from its protective plastic bag 1 Relay contact rating 250V AC / 2A and clip off front cover and note position of Resistive load 115V AC / 3A components as indicated in fig. 1 overleaf. 30V AC / 3A With reference to Figures 1 and 2 overleaf, set D4 on 2 o o switch S5 to indicate C or F as required. 3 If alarm is required, set upper limit alarm temperature by setting DIP switches D1, D2, D3 on S5 down to off DIMENSIONS position and adjust BCD switches S1 to S4 until the LED display indicates the required alarm temperature. For a negative alarm temperature set S1 to position 5. If alarm not required set S1 to S4 until the LED display indicates 4999. Now set the DIP switches on S5 to suit the 4 thermocouple type and accuracy required as shown in figure 2. Make connection to the meter with reference to the 5 Terminal Definition table. 6 The instrument is pre-calibrated in the factory and requires no further adjustment. The calibration INSTALLATION DIAGRAM potentiometers R27, R29, R31 should not be moved. 7 The instrument may now be tested. 8 Once satisfied with the operation, turn off the auxiliary a.c. power supply and unplug the green safety terminals from the rear of the meter. Clip the front cover back on and insert the meter into 9 the panel cut-out.Sna the mounting clips into the side of the case (refer to installation diagram) and tighten the fixing screws until secure in the panel - do not over tighten 10 Reconnect the terminals as per the Terminal Definition table. The meter is now ready for use. DPM8901 Rev. 5 10/03FIG. 1 8901 FRONT VIEW (COVER REMOVED) TERMINAL DEFINITIONS (8901) TERMINAL SYMBOL DESCRIPTION 1 TC HI Sense input HI 2 TC LO Sense input LO 3 CJ HI Cold junction input high 4 CJ LO Cold junction input high 5 REL Alarm relay output 6 REL Alarm relay output 7 230V 8 115V AC power source 90V FIG. 2 SWITCH SETTING TABLE S5 Black = switch position Alarm temperature settings - 1 resolution setting Alarm temperature settings - 0.1 resolution setting Use switches S1 to S4 to set the alarm trip value. To Use switches S1 to S4 to set the alarm trip value. To disable the alarm trip function, set the alarm trip value disable the alarm trip function, set the alarm trip value beyond the maximum display range e.g 4999. Setting beyond the maximum display range e.g 499.9. Setting switch S1 to position 5 allows the setting of negative switch S1 to position 5 allows the setting of negative alarm trip values up to -999 alarm trip values up to -99.9 S1: X 1000 (Set S1=5 for temperature) S1: X 100.0 (Set S1=5 for temperature) S2 : X 100 S2 : X 10.0 S3: X 10 S3: X 1.0 S4: X 1 S4: X 0.1 R27, R29, R31 Calibration Potentiometers LED Alarm output indicator Potentiometers R27, R29, R31 are for calibrating the When the displayed temperature goes 1 degree above meter. However, the meter comes pre-calibrated from that set by alarm switches, the Red LED comes on and the factory and should not be adjusted. the relay contact closes. When the temperature drops 2 degrees below alarm setting the LED goes out and the contacts open. Reset Push button. Resets the module. DQGHUV HOHFWURQLFV SOF Bayham Place, London NW1 OEU UK Tel: +44 (0)20 7380 8167 Fax: +44 (0)20 7874 1908 www.anders.co.uk