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DMS-BZL4-C Datasheet(PDF) 3 Page - Murata Power Solutions Inc. |
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DMS-BZL4-C Datasheet(HTML) 3 Page - Murata Power Solutions Inc. |
3 / 6 page 20mA and adjust R7 so the display reads "1.00". Apply 4mA and verify that the display reads "–1.00", readjust R3 and R7 if necessary. 2. Desired display readings are: 4mA = "–450" 20mA = "450" Use DIP-switch setting #2 in Table 2. Apply 12mA and adjust R3 so the display reads "000". Apply 20mA and adjust R7 so the display reads "450". Apply 4mA and verify that the display reads "–450". Repeat adjustment procedure if necessary. For these display read ings, no decimal points are used. Set SW4, SW5 and SW6 to OFF. 3. Desired display readings are: 4mA = "–650" 20mA = "650" Notice that these readings can be obtained using either DIP-switch setting #1 or DIP-switch setting #2 in Table 2. In situations like this where DIP-switch settings overlap, less-sensitive R3/R7 adjustments can be achieved if the higher DIP-setting # is selected (setting #2 in this example). Apply 12mA and adjust R3 so the display reads "000". Apply 20mA and adjust R7 so the display reads "650". Apply 4mA and verify that the display reads "–650". Repeat adjustment procedure if necessary. DMS–20LCD–4/20B (Bipolar Reading Model) The DMS-20LCD-4/20B's zero-offset circuit differs from the unipolar 'S' model described above in that with the 'B' model, a half-scale 12mA input is normally set to display "000". Therefore, all of the of the DIP-switch settings in Table 2 assume a reading of "000" is desired with a 12mA input. Display readings other than those shown in Table 2 are possible, contact DATEL for more information. When configuring the DMS-20LCD-4/20B for the first time, or when select- ing a new range, set both R3 and R7 fully clockwise (roughly 22 turns) to their minimum offset/minimum-span positions, respectively. Then select the desired readings from Table 2 and configure DIP-switches SW1, SW2, and SW3 accordingly. The procedure below illustrates how to calibrate the DMS-20LCD-4/20B to its factory-calibrated readings of "–1000" with a 4mA input and "1000" with a 20mA input. When performing DIP-switch settings, be sure the DIP- switch's small actuators are firmly engaged in their fully-ON or fully-OFF positions. 1. Set both R3 and R7 fully clockwise. 2. Select DIP-switch setting #1 from Table 2. 3. Apply a precision 12mA input and adjust R3 until the meter's display reads "000". 4. Apply a precision 20mA input and adjust R7 until the meter's display reads "1000". 5. Apply a precision 4mA input and the display should read "–1000". Repeat steps 3 and 4 to make sure the two adjustments did not affect one another. Examples (DMS-20LCD-4/20B-Bipolar Model) 1. Desired display readings are: 4mA = "–1.00" 20mA = "1.00" Use DIP-switch setting #5 in Table 2 and enable decimal point DP2 via SW5. Apply 12mA and adjust R3 so the display reads "0.00". Apply Display Reading SW1 SW2 SW3 4mA 20mA 1. 000 to 1050-1999 Off Off Off 2. 000 to 650-1350 On Off Off 3. 000 to 450-800 Off On Off 4. 000 to 300-500 Off Off On 5. 000 to 200-300 On On On Table 1. DMS-20LCD-4/20S (Unipolar Model) DIP-Switch Settings Display Reading SW1 SW2 SW3 4mA 12mA 20mA 1. –600 to –1000 000 600 to 1000 Off Off Off 2. –350 to –650 000 350 to 650 On Off Off 3. –250 to –400 000 250 to 400 Off On Off 4. –150 to –250 000 150 to 250 Off Off On 5. –100 to –150 000 100 to 150 On On On Table 2. DMS-20LCD-4/20B (Bipolar Model) DIP-Switch Settings DMS-20LCD-4/20P (Positive Reading Model) The DMS-20LCD-4/20P’s Zero-Offset circuit is optimized to produce positive readings at both 4mA and 20mA input levels. As shown in Table 3’s first three columns, a 4mA input can be typically adjusted (using R3, Zero/Offset Adjust) to display any positive reading between “000” and “800”. The corresponding 20mA-input reading is then added to the 4mA offset as a differential whose magnitude is varied by adjusting R7 (Gain/Span Adjust). The ‘Differential Range’ column in Table 3 lists the nominal differential display-readings which can be obtained with R7 at, or very close to, its full-clockwise, minimum span position. The Differential Range column can be used as a guide when configuring the meter for the majority of user applications. Higher differential ranges are obtainable; however, the use of higher differential readings results in correspondingly-lower positive readings with 4mA inputs, that is, R3’s clockwise adjustment-range is re- duced. Example #3 below illustrates this concept. Please contact DATEL if there is any doubt as to whether or not the DMS-20LCD-4/20P can be configured for your display readings requirements. When looking up DIP-switch settings in the Tables and the desired display readings can be achieved with either of two different settings, using the higher setting # will produce less sensitive offset (R3) and span (R7) adjustments. Please keep in mind that the DMS-20LCD standard meter (from which the DMS- 20LCD-4/20 is derived) has an accuracy specification of ±2 counts (max.). Thus, it may not always be possible to obtain the exact desired display reading. 12 3 4 56 ON 12 3 4 5 6 ON 12 3 4 5 6 ON DMS-20LCD-4/20 Series 4-20mA Input Loop-Powered Ultra-Low 1.8V Loop Drop 3½ Digit LCD Display Process Monitors MPM_DMS20LCD-420.B02 Page 3 of 6 Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com |
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