User manual HANNA INSTRUMENTS HI 7874

[. . . ] These instruments are in compliance with the FUNCTIONAL DESCRIPTION FRONT PANEL 1 2 3 SPECIFICATIONS HI 7871 HI 7873 Transmission max 100 m (330 feet) Electrical Connection* HI 7164 undecal connector Level Adjustment high, low high, low, overflow Level Indication high, low high, low, overflow Sensing Bars* 3 4 Transmitter* HI 7874 Output Contact 1 relay 2 relays (2A/250 Vac, 30Vdc) Power Supply 110/115 Vac or 220/240 Vac; 50/60 Hz Environment 0 to 50°C (32 to 122°F); RH max 85% non-condensing Dimensions 83 x 53 x 95 mm (3. 1 x 1. 9 x 3. 7") Weight 250 g (8. 8 oz. ) * Not included with HI 7871 and HI 7873. PRELIMINARY EXAMINATION Remove the instrument from the packing material and examine it carefully. If any damage has occurred during shipment, immediately notify your Dealer or the nearest Hanna Customer Service Center. Note: Conserve all packing material until the instrument has been observed to function correctly. Any defective item must be returned to the Dealer in its original packing. REAR PANEL 4 1. [. . . ] HI 7873 has an additional overflow alarm control. MECHANICAL DIMENSIONS FRONT VIEW CONNECTIONS · Remove the 11-pin connector from the rear of the level controller. WARRANTY HI 7871, HI 7873 and HI 7874 are warranted for two years against defects in workmanship and materials when used for their intended purpose and maintained according to instructions. This warranty is limited to repair or replacement free of charge. Damages due to accident, misuse, tampering or lack of prescribed maintenance are not covered. If service is required, contact the dealer from whom you purchased the instrument. If under warranty, report the model number, date of purchase, serial number and the nature of the failure. If the repair is not covered by the warranty, you will be notified of the charges incurred. If the instrument is to be returned to Hanna Instruments, first obtain a Returned Goods Authorization Number from the Customer Service department and then send it with shipment costs prepaid. When shipping any instrument, make sure it is properly packaged for complete protection. 73mm 2. 87" 79mm 3. 11" 42mm 1. 65" 49mm 1. 93" SIDE VIEW 0. 25/4mm 0. 01/0. 160" ADJUSTABLE LOCATION BRACKET · Connect a 2-wire power cable to terminals #2 and #7 (no ground connection). 79mm 3. 11" All rights are reserved. Reproduction in whole or in part is prohibited without the written consent of the copyright owner, Hanna Instruments. 76mm 3" 95mm MIN 3. 74" Hanna Instruments reserves the right to modify the design, construction and appearance of its products without advance notice. The supplied adjustable brackets allow the controller to slide into the cut-out and hold the unit in place. 95 mm (3. 74") is the minimum space required to install the controller with the cables connected. · Connect the output terminals #4 (common) and #5 (low) to a relay switch (max 2A/230V) to start and stop a pump or to open and close an electrovalve. These two contacts act only as a switch and the pump or electrovalve have to be powered independently. OPERATIONAL GUIDE · Turn on the power supply. 8 seconds, the controller can activate a pump or electrovalve. · When liquid level is below the COM (reference) or the 1 st bar, LOW LED turns on and output contacts (#4 & #5) close, activating a pump/electrovalve. The common terminal (#4) and #3 can also be connected to a device to indicate a "full tank" state. · With HI 7873, connect terminals #10 and #11 to an alarm for monitoring Over Flow condition. · When liquid level reaches the low (1 ) bar, LOW LED goes off but the contacts (#4 & #5) remain closed. · Remove the cover of HI 7874 (bar holder) and connect a 2-wire cable from #8 to positive (+) and #9 to negative (­) terminals of the holder. st · Subsequently, when liquid level drops below the 3rd bar, OVER LED goes off and HIGH LED comes on. When liquid level drops below the 2nd bar, HIGH LED goes off. LOW LED lights up when the level drops below the 1st bar. · HI 7873 can also detect faulty conditions, such as a short or open circuit, in the 2-wire connection between #8 and #9 terminals with HI 7874 bar holder. [. . . ] Operation of these instruments in residential areas could cause unacceptable interferences to radio and TV equipment. Any variation introduced by the user to the supplied equipment may degrade the instrument's EMC performance. For HI 7874 only: The measuring bars at the end of the sensor are sensitive to electrostatic discharges. Connection to level controller should be done with the recommended ferrite close to level controller. ACCESSORIES · With HI 7873, if after reaching HIGH level, liquid level continues to rise and reaches the 3rd bar, the alarm contacts close and the OVER LED comes on. [. . . ]