Chapter 1. Programming Site Data
48 DigitalFlow™ DF868 Multipurpose Ultrasonic Liquid Flowmeter Programming Manual (2-Channel)
1.7.10 Entering KV vs. SS Tables
The KV/SS submenu enables you to enter a table of values of the kinematic viscosity (KV) based on signal strength
(SS). You can then use this table to calculate KV as shown in the KV/SS option (in the ADVAN option of the SETUP
submenu) discussed on page 26. To use the option, you must enter the KV vs. SS pairs in descending order of KV and
ascending order of SS. For example, if pair 1 is KV = 10 centistrokes and SS = 62, then pair 2 must be KV centistrokes
and SS 62. The DF868 accepts 2 to 20 pairs.
1. To enter the GLOBAL menu, press [F3]=GLOBL.
2. To enter the KV/SS submenu, press [
and [F1].
3. Press [ENT] to accept the current # of KV/SS Pairs or enter a new value (from 2 to 20) and press [ENT].
4. Press [ENT] to accept the current Sig Strength value or enter a new value (50.0 to 85.0) and press [ENT]. Enter the
signal strength values in ascending order.
5. Press [ENT] to accept the current Kin Viscosity value or enter a new value (0.050 to 500.) and press [ENT]. Enter
the kinematic viscosity values in descending order.
The Sig Strength and Kin Viscosity prompts repeat for each pair. After entering all the pairs, the meter returns to the
Global PROGRAM menu.
1.7.11 Entering Temperature vs. Viscosity Tables
The TmpKV submenu enables you to enter temperature vs. viscosity tables for up to three petrochemical products.
Users can program the names of each product, along with temperature vs. viscosity data points for each table. To
apply the tables, you must program the DF868 to use the table for the desired fluid (discussed in Calculating
Kinematic Viscosity on page 26), and program the temperature input source (as shown in Setting Up Temperature
Inputs on
page 19).
Once the tables are applied, the DF868 automatically performs the following steps:
1. It accepts the input from the programmed temperature source.
2. It calculates the fluid viscosity using linear interpolation from the tabulated fluid data.
3. It performs a dynamic calculation of the Reynolds number.
4. It calculates the appropriate K-factor using the standard Colebrook relationship.
1.7.11.1 Entering the Fluid Label and Name
1. To enter the GLOBAL menu, press [F3]=GLOBL.
2. To enter the TmpKV submenu, press [
and [F2].
3. At the Temp/KV Fluid Table prompt, press [F1]-[F3] to select the table for data entry.
Note: Key [F1] for Fluid #01 is used as an example in the following steps.
4. Edit the current Label (FL#01) to any desired label with a maximum length of five characters (as shown in Table 1).
Press [ENT].
5. Edit the current Name (Fluid #1) to any desired name with a maximum length of 11 characters.
1.7.11.2 Entering the Table Data
6. Enter the desired # of Table pairs (2 to 20), and press [ENT].
IMPORTANT: At the next prompt, the temperature values entered must be in the range of -148 to 662°F or °C. The
values will appear as °F if the meter is set for English units or °C if the meter is set for metric units.
Temperature values must be entered in ascending order.
7. Press [ENT] to accept the current Temperature value or enter a new value (with up to four decimal places) and
press [ENT].
IMPORTANT: At the next prompt, the kinematic viscosity values entered must be in the range of 0.045 to 10000*10-6
ft^2/s or m^2/s. The values will appear as ft^2/s if the meter is set for English units or m^2/s if the meter
is set for metric units.
8. Press [ENT] to accept the current Kin Viscosity value or enter a new value (with up to three decimal places) and
press [ENT].
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